Merge pull request #683 from PeterDaveHello/patch-2

make CI build faster

.travis.yml

 language: node_js
 language: node_js
 node_js:
 node_js:
   - "0.10"
   - "0.10"
+git:
+  depth: 1
 before_script:
 before_script:
   - npm install -g grunt-cli
   - npm install -g grunt-cli
 after_script:
 after_script: