title: angularjs drag and drop plugin drop issue
body: <p>I'm using angular-dragdrop.js lib in my project and I have issue with drop callback function. All the other callback functions are working. I debugged my code many times but can't find the answer,
  has someone encountered with this issue?</p>
  
  <p>here is my html and js code:</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;li class="li-draggable" data-drag="true"
             jqyoui-draggable="{animate: true, 
                                placeholder: 'keep', 
                                onStart: 'startCallback', 
                                onStop: 'stopCallback',
                                onDrag: 'dragCallback'}"
             data-jqyoui-options="{snap: true, cursor: 'move', revert: 'invalid', helper: 'clone'}"&gt;
             &lt;a&gt;Text &lt;i class="icon-pencil pull-right"&gt;&lt;/i&gt;&lt;/a&gt;
  &lt;/li&gt;
  &lt;div class="dummyCell" data-drop="true"
               jqyoui-droppable="{multiple: true,
                                 onDrop: 'dropCallback',
                                 onOver: 'overCallback',
                                 onOut: 'outCallback'}"
               data-jqyoui-options="{hoverClass: 'hoverClass'}"&gt;&lt;/div&gt;
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>$scope.startCallback = function(event, ui) {
      console.log('You started draggin');
  };
  
  $scope.stopCallback = function(event, ui) {
      console.log('Why did you stop draggin me?');
  };
  
  $scope.dragCallback = function(event, ui) {
      console.log('hey, look I`m flying');
  };
  
  $scope.dropCallback = function(event, ui) {
      console.log('hey, doneeeeeee');
  };
  
  $scope.overCallback = function(event, ui) {
      console.log('Look, I`m over you');
  };
  
  $scope.outCallback = function(event, ui) {
      console.log('I`m not, hehe');
  };
  </code></pre>
  
  <p>Any help will be appreciated. thanks.</p>
  
  <p>Updated:</p>
  
  <p>I was not getting any error in console when dropped:
  <img src="https://i.stack.imgur.com/HIQWl.png" alt="enter image description here"></p>