diff --git a/Cargo.lock b/Cargo.lock
index 7d119e81..0b91caf3 100755
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -14,7 +14,7 @@ dependencies = [
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -40,7 +40,7 @@ dependencies = [
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "num_cpus 1.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -66,10 +66,10 @@ dependencies = [
  "cookie 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "encoding 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "flate2 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "h2 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "h2 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "httparse 1.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "language-tags 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -92,7 +92,7 @@ dependencies = [
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-current-thread 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -182,7 +182,7 @@ name = "backtrace-sys"
 version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -231,7 +231,7 @@ name = "brotli-sys"
 version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -270,7 +270,7 @@ dependencies = [
 
 [[package]]
 name = "cc"
-version = "1.0.30"
+version = "1.0.31"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -459,7 +459,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "env_logger"
-version = "0.5.13"
+version = "0.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -509,7 +509,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "flate2"
-version = "1.0.6"
+version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crc32fast 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -566,7 +566,7 @@ dependencies = [
 
 [[package]]
 name = "h2"
-version = "0.1.16"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -748,7 +748,7 @@ dependencies = [
  "actix 0.7.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "actix-web 0.7.18 (registry+https://github.com/rust-lang/crates.io-index)",
  "docopt 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "mapbox_expressions_to_sql 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -816,7 +816,7 @@ name = "miniz-sys"
 version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -833,7 +833,7 @@ name = "miniz_oxide_c_api"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1249,7 +1249,7 @@ name = "ring"
 version = "0.13.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "untrusted 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1500,7 +1500,7 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "0.1.16"
+version = "0.1.17"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1513,10 +1513,11 @@ dependencies = [
  "tokio-fs 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-sync 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-threadpool 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-trace-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-udp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1584,7 +1585,7 @@ dependencies = [
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio-sync 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio-sync 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1605,7 +1606,7 @@ dependencies = [
 
 [[package]]
 name = "tokio-sync"
-version = "0.1.3"
+version = "0.1.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1652,6 +1653,14 @@ dependencies = [
  "tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "tokio-trace-core"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "lazy_static 1.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "tokio-udp"
 version = "0.1.3"
@@ -1751,7 +1760,7 @@ dependencies = [
  "lru-cache 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "resolv-conf 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)",
  "trust-dns-proto 0.6.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1981,7 +1990,7 @@ dependencies = [
 "checksum byte-tools 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "560c32574a12a89ecd91f5e742165893f86e3ab98d21f8ea548658eb9eef5f40"
 "checksum byteorder 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a019b10a2a7cdeb292db131fc8113e57ea2a908f6e7894b0c3c671893b65dbeb"
 "checksum bytes 0.4.12 (registry+https://github.com/rust-lang/crates.io-index)" = "206fdffcfa2df7cbe15601ef46c813fce0965eb3286db6b56c583b814b51c81c"
-"checksum cc 1.0.30 (registry+https://github.com/rust-lang/crates.io-index)" = "d01c69d08ff207f231f07196e30f84c70f1c815b04f980f8b7b01ff01f05eb92"
+"checksum cc 1.0.31 (registry+https://github.com/rust-lang/crates.io-index)" = "c9ce8bb087aacff865633f0bd5aeaed910fe2fe55b55f4739527f2e023a2e53d"
 "checksum cfg-if 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)" = "11d43355396e872eefb45ce6342e4374ed7bc2b3a502d1b28e36d6e23c05d1f4"
 "checksum cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "ddfc5b9aa5d4507acaf872de71051dfd0e309860e88966e1051e462a077aac4f"
 "checksum constant_time_eq 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "8ff012e225ce166d4422e0e78419d901719760f62ae2b7969ca6b564d1b54a9e"
@@ -2004,13 +2013,13 @@ dependencies = [
 "checksum encoding-index-singlebyte 1.20141219.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3351d5acffb224af9ca265f435b859c7c01537c0849754d3db3fdf2bfe2ae84a"
 "checksum encoding-index-tradchinese 1.20141219.5 (registry+https://github.com/rust-lang/crates.io-index)" = "fd0e20d5688ce3cab59eb3ef3a2083a5c77bf496cb798dc6fcdb75f323890c18"
 "checksum encoding_index_tests 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a246d82be1c9d791c5dfde9a2bd045fc3cbba3fa2b11ad558f27d01712f00569"
-"checksum env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)" = "15b0a4d2e39f8420210be8b27eeda28029729e2fd4291019455016c348240c38"
+"checksum env_logger 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b61fa891024a945da30a9581546e8cfaf5602c7b3f4c137a2805cf388f92075a"
 "checksum error-chain 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "6930e04918388a9a2e41d518c25cf679ccafe26733fb4127dbf21993f2575d46"
 "checksum failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "795bd83d3abeb9220f257e597aa0080a508b27533824adf336529648f6abf7e2"
 "checksum failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "ea1063915fd7ef4309e222a5a07cf9c319fb9c7836b1f89b85458672dbb127e1"
 "checksum fake-simd 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e88a8acf291dafb59c2d96e8f59828f3838bb1a70398823ade51a84de6a6deed"
 "checksum fallible-iterator 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eb7217124812dc5672b7476d0c2d20cfe9f7c0f1ba0904b674a9762a0212f72e"
-"checksum flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2291c165c8e703ee54ef3055ad6188e3d51108e2ded18e9f2476e774fc5ad3d4"
+"checksum flate2 1.0.7 (registry+https://github.com/rust-lang/crates.io-index)" = "f87e68aa82b2de08a6e037f1385455759df6e445a8df5e005b4297191dbf18aa"
 "checksum fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "2fad85553e09a6f881f739c29f0b00b0f01357c743266d478b68951ce23285f3"
 "checksum fuchsia-cprng 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "a06f77d526c1a601b7c4cdd98f54b5eaabffc14d5f2f0296febdc7f357c6d3ba"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
@@ -2018,7 +2027,7 @@ dependencies = [
 "checksum futures 0.1.25 (registry+https://github.com/rust-lang/crates.io-index)" = "49e7653e374fe0d0c12de4250f0bdb60680b8c80eed558c5c7538eec9c89e21b"
 "checksum futures-cpupool 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "ab90cde24b3319636588d0c35fe03b1333857621051837ed769faefb4c2162e4"
 "checksum generic-array 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ef25c5683767570c2bbd7deba372926a55eaae9982d7726ee2a1050239d45b9d"
-"checksum h2 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "ddb2b25a33e231484694267af28fec74ac63b5ccf51ee2065a5e313b834d836e"
+"checksum h2 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "910a5e7be6283a9c91b3982fa5188368c8719cce2a3cf3b86048673bf9d9c36b"
 "checksum hex 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d6a22814455d41612f41161581c2883c0c6a1c41852729b17d5ed88f01e153aa"
 "checksum hmac 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "44f3bdb08579d99d7dc761c0e266f13b5f2ab8c8c703b9fc9ef333cd8f48f55e"
 "checksum hostname 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "21ceb46a83a85e824ef93669c8b390009623863b5c195d1ba747292c0c72f94e"
@@ -2126,7 +2135,7 @@ dependencies = [
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
 "checksum tilejson 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "2117abf55755175b050f820472ddcd7762d7c60764af8bdfa828734276841847"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
-"checksum tokio 0.1.16 (registry+https://github.com/rust-lang/crates.io-index)" = "fcaabb3cec70485d0df6e9454fe514393ad1c4070dee8915f11041e95630b230"
+"checksum tokio 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "1021bb1f4150435ab8f222eb7ed37c60b2d57037def63ba43085a79f387512d7"
 "checksum tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c501eceaf96f0e1793cf26beb63da3d11c738c4a943fdf3746d81d64684c39f"
 "checksum tokio-current-thread 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "c756b04680eea21902a46fca4e9f410a2332c04995af590e07ff262e2193a9a3"
 "checksum tokio-executor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "30c6dbf2d1ad1de300b393910e8a3aa272b724a400b6531da03eed99e329fbf0"
@@ -2134,10 +2143,11 @@ dependencies = [
 "checksum tokio-io 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "5090db468dad16e1a7a54c8c67280c5e4b544f3d3e018f0b913b400261f85926"
 "checksum tokio-reactor 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "6af16bfac7e112bea8b0442542161bfc41cbfa4466b580bdda7d18cb88b911ce"
 "checksum tokio-signal 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)" = "dd6dc5276ea05ce379a16de90083ec80836440d5ef8a6a39545a3207373b8296"
-"checksum tokio-sync 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1bf2b9dac2a0509b5cfd1df5aa25eafacb616a42a491a13604d6bbeab4486363"
+"checksum tokio-sync 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "fda385df506bf7546e70872767f71e81640f1f251bdf2fd8eb81a0eaec5fe022"
 "checksum tokio-tcp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "1d14b10654be682ac43efee27401d792507e30fd8d26389e1da3b185de2e4119"
 "checksum tokio-threadpool 0.1.12 (registry+https://github.com/rust-lang/crates.io-index)" = "742e511f6ce2298aeb86fc9ea0d8df81c2388c6ebae3dc8a7316e8c9df0df801"
 "checksum tokio-timer 0.2.10 (registry+https://github.com/rust-lang/crates.io-index)" = "2910970404ba6fa78c5539126a9ae2045d62e3713041e447f695f41405a120c6"
+"checksum tokio-trace-core 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "350c9edade9830dc185ae48ba45667a445ab59f6167ef6d0254ec9d2430d9dd3"
 "checksum tokio-udp 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "66268575b80f4a4a710ef83d087fdfeeabdce9b74c797535fbac18a2cb906e92"
 "checksum tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "037ffc3ba0e12a0ab4aca92e5234e0dedeb48fddf6ccd260f1f150a36a9f2445"
 "checksum tower-service 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b32f72af77f1bfe3d3d4da8516a238ebe7039b51dd8637a09841ac7f16d2c987"
diff --git a/Cargo.toml b/Cargo.toml
index bae74d2c..a48a92a8 100755
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,11 +7,11 @@ authors = ["Stepan Kuzmin <to.stepan.kuzmin@gmail.com>"]
 actix = "0.7"
 actix-web = "0.7"
 docopt = "1"
-env_logger = "0.5"
+env_logger = "0.6"
 futures = "0.1"
 log = "0.4"
 mapbox_expressions_to_sql = "0.1.0"
-num_cpus = "1.8"
+num_cpus = "1.0"
 postgres = { version = "0.15", features = ["with-time", "with-uuid", "with-serde_json"] }
 r2d2 = "0.8"
 r2d2_postgres = "0.14"