A 
DeleteCallback is used to run code after saving a 
MesosferData in a background
 thread.
 
 The easiest way to use a 
DeleteCallback is through an anonymous inner class. Override the
 
done function to specify what the callback should do after the delete is complete.
 The 
done function will be run in the UI thread, while the delete happens in a
 background thread. This ensures that the UI does not freeze while the delete happens.
 
 For example, this sample code deletes the object 
myData and calls a different
 function depending on whether the save succeeded or not.
 
 
 myData.deleteAsync(new DeleteCallback() {
   public void done(MesosferException e) {
     if (e == null) {
       myDataWasDeletedSuccessfully();
     } else {
       myDataDeleteDidNotSucceed();
     }
   }
 });