code: function addOptionMethod( PluginClass ) {
  				// don't overwrite original option method
  				if ( PluginClass.prototype.option ) {
  					return;
  				}
  
  			  // option setter
  			  PluginClass.prototype.option = function( opts ) {
  			    // bail out if not an object
  			    if ( !$.isPlainObject( opts ) ){
  			      return;
  			    }
  			    this.options = $.extend( true, this.options, opts );
  			  };
  			}
docs: -------------------------- addOptionMethod -------------------------- // 
  adds option method -> $().plugin('option', {...})
  @param {Function} PluginClass - constructor class