whole_func_string: function(fn, options) {
  			this._list.push(_.extend({order: 0}, options || {}, {fn: fn}));
  		}
func_code_string: function(fn, options) {
  			this._list.push(_.extend({order: 0}, options || {}, {fn: fn}));
  		}
func_documentation_string: Adds function handler
  @param {Function} fn Handler
  @param {Object} options Handler options. Possible values are:<br><br>
  <b>order</b> : (<code>Number</code>) – order in handler list. Handlers
  with higher order value will be executed earlier.