add travis file

.travis.yml

@@ -0,0 +1,44 @@
+language: haskell
+env:
+- GHCVER=7.6.3
+- GHCVER=7.8.3
+- GHCVER=7.10.1
+- GHCVER=head
+matrix:
+  allow_failures:
+  - env: GHCVER=head
+before_install:
+- |
+  if [ $GHCVER = `ghc --numeric-version` ]; then
+    travis/cabal-apt-install --enable-tests $MODE
+    export CABAL=cabal
+  else
+    travis_retry sudo add-apt-repository -y ppa:hvr/ghc
+    travis_retry sudo apt-get update
+    travis_retry sudo apt-get install cabal-install-1.22 ghc-$GHCVER happy
+    export CABAL=cabal-1.22
+    export PATH=/opt/ghc/$GHCVER/bin:$PATH
+  fi
+- $CABAL update
+- |
+  if [ $GHCVER = "head" ] || [ $GHCVER = "7.8.3" ] || [ $GHCVER = "7.10.1" ]; then
+    $CABAL install happy alex
+    export PATH=$HOME/.cabal/bin:$PATH
+  fi
+install:
+- $CABAL install --dependencies-only --enable-tests
+- $CABAL configure -flib-Werror --enable-tests $MODE
+script:
+- ghc --numeric-version
+- $CABAL check
+- $CABAL build
+- $CABAL test --show-details=always
+deploy:
+  provider: hackage
+  username: AlexanderThiemann
+  skip_cleanup: true
+  on:
+    condition: "$GHCVER = 7.8.3"
+    tags: true
+  password:
+    secure: IX4eMDPtSCbNl/3yJpRsvgCsJ5KanCdyENqxQCxoVwe1cv1zK5lcqy2fwlJmFdCXPSuhxlWq9YIbmaOjPS316aGjMfNx+zw/+BQAyKvHU2HPXjAfUZElaVr4fHafL8s2QC/w3TkxjqrA1mGi9qKwX8iSFsxGccif62BmEGB7fQ8=