Install bower and get dependencies on Travis CI boxes

Author: anantn

.travis.yml

@@ -8,7 +8,9 @@ install:
   - git clone git://github.com/n1k0/casperjs.git ~/casperjs
   - export PATH=$PATH:~/casperjs/bin
   - npm install -g grunt-cli
+  - npm install -g bower
   - npm install
+  - bower install
 before_script:
   - phantomjs --version
   - casperjs --version