le node to a new tree position
        @param {Object} dragNode [Tree file node to be moved]
        @param {Object} dropNode [Tree node destiny]
        @return {String} [Movement allowed]
      */
      moveFile: function (dragNode, dropNode) {
        var el = this;

        if (dragNode) {
          var newPath = dropNode.path + "/" + dragNode.name;
          var extension = dragNode.extension ? "." + dragNode.extension : dragNode.extension;

          // Denied append node with a name of an existing no