chore(tests): fix karma debug in Chrome

Karma-chrome-launcher was missing. Forgot it in ee07267

Author: seriema

package.json

@@ -49,6 +49,7 @@
     "jasmine-core": "^2.3.4",
     "jshint-stylish": "^2.0.1",
     "karma": "^0.13.4",
+    "karma-chrome-launcher": "^0.2.1",
     "karma-coverage": "^0.5.0",
     "karma-firefox-launcher": "^0.1.3",
     "karma-jasmine": "^0.3.6",
@@ -65,7 +66,7 @@
   },
   "scripts": {
     "test": "grunt test",
-    "debug": "./node_modules/.bin/karma start karma.conf.js --browsers=Chrome --debug --autoWatch=true",
+    "debug": "karma start karma.conf.js --browsers=Chrome --debug --autoWatch=true",
     "saucelabs": "grunt karma:sauce",
     "coveralls": "grunt coveralls"
   }