coverage flag added to jest, watch mode support

Author: udaypydi

package.json

@@ -7,7 +7,8 @@
     "build": "webpack ---config ./config/webpack.prod.config.js",
     "dev": "webpack-dev-server --config ./config/webpack.dev.config.js",
     "lint": "./node_modules/.bin/eslint --ext .js,.jsx src/",
-    "test": "jest"
+    "test": "jest --collect-coverage",
+    "test:watch": "jest --watch"
   },
   "keywords": [
     "react",