Add missing karma-chrome-launcher dependency to package.json

package.json

@@ -58,6 +58,7 @@
     "istanbul-instrumenter-loader": "^0.1.3",
     "jasmine-core": "^2.3.4",
     "karma": "^0.12.36",
+    "karma-chrome-launcher": "^0.2.0",
     "karma-coverage": "^0.4.2",
     "karma-jasmine": "^0.3.5",
     "karma-webpack": "^1.5.1",