code: function (addon) {
  			var editor = $.fn.mediumInsert.settings.editor,
  					buttonLabels = (editor && editor.options) ? editor.options.buttonLabels : '';
  
  			var buttons;
  			if($.fn.mediumInsert.settings.enabled) {
  			buttons = '<div class="mediumInsert-buttons">'+
  						'<a class="mediumInsert-buttonsShow">+</a>'+
  						'<ul class="mediumInsert-buttonsOptions medium-editor-toolbar medium-editor-toolbar-active">';
  			} else {
  			buttons = '<div class="mediumInsert-buttons hide">'+
  						'<a class="mediumInsert-buttonsShow">+</a>'+
  						'<ul class="mediumInsert-buttonsOptions medium-editor-toolbar medium-editor-toolbar-active">';
  			}
  
  			if (Object.keys($.fn.mediumInsert.settings.addons).length === 0) {
  				return false;
  			}
  
  			if (typeof addon === 'undefined') {
  				$.each($.fn.mediumInsert.settings.addons, function (i) {
  					buttons += '<li>' + addons[i].insertButton(buttonLabels) + '</li>';
  				});
  			} else {
  				buttons += '<li>' + addons[addon].insertButton(buttonLabels) + '</li>';
  			}
  
  			buttons += '</ul></div>';
  
  			return buttons;
  		}
docs: Return insert buttons optionally filtered by addon name
  
  @param {string} addon Addon name of addon to display only
  @return {void}