Remove unnecessary karma-sinon dev dependency

Author: AlexKVal

karma.conf.js

@@ -25,7 +25,6 @@ module.exports = function (config) {
 
     frameworks: [
       'mocha',
-      'sinon',
       'sinon-chai'
     ],
 

package.json

@@ -78,7 +78,6 @@
     "karma-mocha": "~0.2.0",
     "karma-mocha-reporter": "^1.0.2",
     "karma-phantomjs-launcher": "^0.2.0",
-    "karma-sinon": "^1.0.3",
     "karma-sinon-chai": "^1.0.0",
     "karma-sourcemap-loader": "^0.3.4",
     "karma-webpack": "^1.5.0",