Add explicitly node-libs-browser dependency.

Fixes `peerDependency` warning for webpack.

Author: AlexKVal

package.json

@@ -80,6 +80,7 @@
     "less-loader": "^2.1.0",
     "lodash": "^3.5.0",
     "mocha": "^2.2.1",
+    "node-libs-browser": "^0.5.2",
     "nodemon": "^1.3.7",
     "portfinder": "^0.4.0",
     "react": "^0.13.1",