title: how to populate a store with a single json object in gxt3
body: <p>I am using Sencha GXT3 app for a html interface. Data is retrieved in json format from a REST service. How exactly do I fill a store with a single object for reading and later manipulating and saving?</p>
  
  <p>This is not about lists of objects, but really a specific single json map which I want to load into a store.</p>
  
  <p>Any help would be highly appreciated.</p>