code: function TL_Error(message_key, detail) {
      this.name = 'TL.Error';
      this.message = message_key || 'error';
      this.message_key = this.message;
      this.detail = detail || '';
    
      // Grab stack?
      var e = new Error();
      if(e.hasOwnProperty('stack')) {
          this.stack = e.stack;
      }
  }
docs: /* Timeline Error class