Update .travis.yml

Author: drinckes

.travis.yml

@@ -7,6 +7,8 @@ matrix:
     - language: node_js
       node_js:
         - "0.10"
+      script:
+        - cd js && npm install && npm test
     - language: rust
       script: 
         - cd rust/
@@ -15,11 +17,9 @@ matrix:
 
 # Define the list of directories to execute tests in.
 env:
-  - TEST_DIR=js
   - TEST_DIR=go
   - TEST_DIR=ruby
   - TEST_DIR=python
-  - TEST_DIR=rust
 
 # Test script to run. This is called once for each TEST_DIR value above.
 script: ./run_tests.sh