code: function(name, del){
              if (!_map.hasOwnProperty(name)) {
                  return;
              }
              var fn = _map[name];
              
              if (del) {
                  delete _map[name];
              }
              return fn;
          }
docs: Retrieves the function referred to by the given name
  @param {String} name The name of the function to retrieve
  @param {Boolean} del If the function should be deleted after retrieval
  @return {Function} The stored function
  @namespace easyXDM.fn