old_contents: var webpack = require('webpack');
  
  module.exports = {
    entry: [
      './js/app'
    ],
    output: {
      path: __dirname,
      // publicPath: '/build/',
      filename: './build/bundle.js'
    },
    plugins: [
    ],
    resolve: {
      extensions: ['', '.js', '.jsx']
    },
    module: {
      loaders: [
        { test: /\.jsx$/, loaders: ['jsx'] }
      ]
    }
  };
  
new_contents: var webpack = require('webpack');
  
  module.exports = {
    entry: [
      './js/bootstrap'
    ],
    output: {
      path: __dirname,
      // publicPath: '/build/',
      filename: './build/bundle.js'
    },
    plugins: [
    ],
    resolve: {
      extensions: ['', '.js', '.jsx']
    },
    module: {
      loaders: [
        { test: /\.jsx$/, loaders: ['jsx'] }
      ]
    }
  };
  
subject: build entry point