Add in post build step to minify code using UglifyJS

I tried to use a couple of things integrated directly with babel,

+ https:/babel/babili - Issue with es2015 preset babel/minify#556
+ https:/rreverser/babel-plugin-uglify - Just didn't work!

So, added in a script using the UglifyJS2 CLI tool which saves ~20% of
the size! ✌

package.json

@@ -4,7 +4,8 @@
  "description": "uStyle React Components",
  "main": "dist/index.js",
  "scripts": {
- "build": "rm -rf dist; babel src --out-dir dist",
+ "build": "rm -rf dist; babel src --out-dir dist; echo Pre-Minify: `du -sh dist | cut -f1`",
+ "postbuild": "find dist -type f -exec uglifyjs {} --mangle --compress -o {} \\;; echo Post-Minify: `du -sh dist | cut -f1`",
  "start": "webpack-dev-server",
  "commit-dist": "npm run build; npm run lint:fix; git add dist",
  "bump-version": "nver; git add package.json",
@@ -34,8 +35,6 @@
  "react": ">=15.3"
  },
  "devDependencies": {
- "react": ">=15.3",
- "react-dom": ">=15.3",
  "babel-cli": "^6.24.0",
  "babel-core": "^6.24.0",
  "babel-loader": "^6.4.1",
@@ -44,8 +43,11 @@
  "nodemon": "^1.11.0",
  "nver": "^0.0.15",
  "pre-commit": "^1.2.2",
+ "react": ">=15.3",
+ "react-dom": ">=15.3",
  "standard": "^10.0.2",
+ "uglify-js": "^3.0.15",
  "webpack": "^2.3.3",
  "webpack-dev-server": "^2.4.2"
  }
-}
+}