Merge pull request react-bootstrap#766 from AlexKVal/webpackPeerDep

Add explicitly node-libs-browser dependency.

Author: mtscout6

package.json

@@ -79,6 +79,7 @@
     "less-loader": "^2.1.0",
     "lodash": "^3.5.0",
     "mocha": "^2.2.1",
+    "node-libs-browser": "^0.5.2",
     "nodemon": "^1.3.7",
     "phantomjs": "^1.9.17",
     "portfinder": "^0.4.0",