travis only build master

Author: Evan You

.travis.yml

@@ -1,6 +1,9 @@
 language: node_js
 node_js:
   - "0.10"
+branches:
+  only:
+    - master
 before_install:
   - npm install -g grunt-cli component
   - git clone git://github.com/n1k0/casperjs.git ~/casperjs