docs: function mountAt(url) {
  	var opts = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];
  	var name = opts.name;
  
  	return {
  		state: this,
  		url: url,
  		name: name,
  		buildUiRouterState: builder
  	};
  
  	function builder(options) {
  		var state = buildUiRouterState(this.state, options);
  
  		if (this.url !== undefined) {
  			state.url = url;
  		}
  
  		if (this.name !== undefined) {
  			state.name = name;
  		}
  
  		return state;
  	}
  }