title: Webpack-dev-server not bundling even after showing bundle valid message
body: <p>I've set up a basic react application with webpack but I couldn't get the <code>webpack-dev-server</code> running properly. </p>
  
  <p>I've installed <code>webpack-dev-server</code> globally and tried running the command <code>sudo webpack-dev-server --hot</code> as hot reloading was required. </p>
  
  <p>The project seems to be working fine with just <code>webpack</code> cmd. It builds into my build folder and I can get it working via some server but it wont work with <code>webpack-dev-server</code>. From terminal its clear that the build process has completed with no error being thrown [<code>webpack: bundle is now VALID.</code>] and its in fact watching properly because on any change it does trigger the build process but it doesn't really gets built [it doesn't serve my bundle.js]. I tried changing the entire config and still couldn't get the issue resolved. </p>
  
  <p>It would be much appreciated if someone can help. </p>
  
  <p>Following is my webpack.config.js file. </p>
  
  <pre><code>var path = require('path');
  
  module.exports = {
      devtool: '#inline-source-map"',
  
      watch: true,
      colors: true,
      progress: true,
  
      module: {
          loaders: [{
              loader: "babel",
              include: [
                  path.resolve(__dirname, "src"),
              ],
              test: /\.jsx?$/,
              query: {
                  plugins: ['transform-runtime'],
                  presets: ['es2015', 'react', 'stage-0'],
              }
          }, {
              loader: 'style!css!sass',
              include: path.join(__dirname, 'src'),
              test: /\.scss$/
          }]
      },
  
      plugins: [],
      output: {
          path: path.join(__dirname, 'build/js'),
          publicPath: '/build/',
          filename: '[name].js'
      },
      entry: {
          bundle: [
              './src/index.js'
          ]
      },
  
      devServer: {
          contentBase: "./",
          inline: true,
          port: 8080
      },
  };
  </code></pre>