code: function( name, path, offset, bgsize ) {
  			name = name.toLowerCase();
  			if ( !this.icons[ name ] ) {
  				this.icons[ name ] = {
  					path: path,
  					offset: offset || 0,
  					bgsize: bgsize || '16px'
  				};
  			}
  		}
docs: Registers an icon.
  
  @param {String} name The icon name.
  @param {String} path The path to the icon image file.
  @param {Number} [offset] The vertical offset position of the icon, if
  available inside a strip image.
  @param {String} [bgsize] The value of the CSS "background-size" property to
  use for this icon