Add correct directories to travis cache

no ref

.travis.yml

@@ -8,7 +8,8 @@ sudo: false
 cache:
   directories:
     - node_modules
-    - bower_components
+    - core/client/node_modules
+    - core/client/bower_components
 addons:
   postgresql: "9.3"
 env:
@@ -42,4 +43,4 @@ after_success:
         fi
       else
         echo "This is a PR. No coverage generated."
-      fi
+      fi