title: Ext JS 4.2.1 + Sencha CMD - ItemSelector Buttons CSS not loaded
body: <p>I generated an Ext JS 4.2.1.883 application with the sencha CMD 3.1.2.342 using nthe neptune theme...
  I've got an <code>ItemSelector</code> Control in my View with the Buttons <code>'add'</code> and <code>'remove'</code>.. </p>
  
  <p>I executed a <code>sencha ant cleaen</code> and <code>sencha app build</code> still my Buttons of the ItemsControl are without any Icon. It seems that my generated <code>Appname-all.css</code> does not include the CSS of the <code>ItemSelector.css</code> file in my <code>ext\src\ux</code> folder where e.g a style would be defined for the css class .x-form-itemselector-add. In the <code>Appname-all.scss</code> file i found a variable <code>$include-ext-ux-form-itemselector</code> which is set to true. I dont know how i can fix this.. 
  I already tried to write <code>Ext.require('Ext.ux.form.ItemSelector');</code> and <code>Ext.Loader.setPath('Ext.ux', './ext/src/ux');</code> in my application.js file.</p>
  
  <p>I dont know how to proceed - please help!</p>