code: function( config ) {
  		
  		for( var key in lm.config.itemDefaultConfig ) {
  			if( config[ key ] === undefined ) {
  				config[ key ] = lm.config.itemDefaultConfig[ key ];
  			}
  		}
  		
  		return config;
  	}
docs: Extends an item configuration node with default settings
  @private
  @param   {configuration item node} config
  
  @returns {configuration item node} extended config