Added Webpack configuration for production build.

webpack.config.js

@@ -3,7 +3,8 @@
//  http://maratbn.com/blogs/2017/01/14/minimalistic-react-webapp/


const path = require('path');
const path = require('path'),
      webpack = require('webpack');

module.exports = {
    entry: [path.join(__dirname, 'webpack_in', 'entry.js'),
@@ -26,5 +27,13 @@ module.exports = {
    output: {
        path:      path.join(__dirname, 'webpack_out'),
        filename:  'minimalistic_react.js'
      }
      },
    plugins: [
        new webpack.optimize.UglifyJsPlugin,
        new webpack.optimize.DedupePlugin,
        new webpack.DefinePlugin({'process.env': {
                                      'NODE_ENV': JSON.stringify('production')
                                    }
                                  })
      ]
  };