title: Grunt requirejs concatenate and uglify the require modules to one file
body: <p>Presently using grunt-contrib-requirejs plugin which has got </p>
  
  <pre><code>optimize : 'uglify2'
  </code></pre>
  
  <p>but no concat files to a single file option is found in that plugin. how to add or any example. I need all js files to be concatenated and uglified to a single file which has to be loaded in the very first load itself.</p>
  
  <p>Thanks.</p>