Add Karma for testing

.travis.yml

@@ -2,5 +2,4 @@ language: node_js
 node_js:
   - '0.10'
 before_script:
-  - 'npm install -g grunt-cli' 
-  - 'npm install grunt-karma --save-dev'
+  - 'npm install -g grunt-cli'

package.json

@@ -29,6 +29,7 @@
     "load-grunt-tasks": "~0.3.0",
     "grunt-contrib-jshint": "~0.8.0",
     "grunt": "~0.4.2",
-    "grunt-contrib-uglify": "~0.3.2"
+    "grunt-contrib-uglify": "~0.3.2",
+    "karma": "~0.8"
   }
 }