code: function getForwardedAttributes( section ) {
  
  		var attributes = section.attributes;
  		var result = [];
  
  		for( var i = 0, len = attributes.length; i < len; i++ ) {
  			var name = attributes[i].name,
  				value = attributes[i].value;
  
  			// disregard attributes that are used for markdown loading/parsing
  			if( /data\-(markdown|separator|vertical|notes)/gi.test( name ) ) continue;
  
  			if( value ) {
  				result.push( name + '="' + value + '"' );
  			}
  			else {
  				result.push( name );
  			}
  		}
  
  		return result.join( ' ' );
  
  	}
docs: Given a markdown slide section element, this will
  return all arguments that aren't related to markdown
  parsing. Used to forward any other user-defined arguments
  to the output markdown slide.