title: Generating source maps from browserify using grunt
body: <p>I have followed the instructions here: <a href="https://www.npmjs.org/package/grunt-browserify">https://www.npmjs.org/package/grunt-browserify</a>, to try and set up source maps for browserify on grunt. The options for browserify in my gruntfile are : </p>
  
  <pre><code>browserify: {
              options: {
                  bundleOptions : {
                      debug: true 
                  }
              },
              dist: {
                  files: {
                      "public/client.bundle.js": ["bundle.js"]
                  }
              }
          }
  </code></pre>
  
  <p>The generation of bundle.js happens without any issues, however the source map generation does not happen. Is there anything wrong with my grunt-browserify options. </p>
  
  <p>Thanks for looking.</p>