code: function(uri) {
  
          if (this._routes[uri] !== undefined) {
              return uri;
          }
  
          for (var route in this._routes) {
              if (this.is(route, uri)) {
                  return route;
              }
          }
  
          return false;
      }
docs: Check if route is defined. Returns route if found or false
  @param uri
  @returns {*}