Angular Cli 1.0.0-beta.11-webpack.8: ng build failed if route 'loadChildren'

https://github.com/angular/angular-cli/blob/master/addon/ng2/models/find-lazy-modules.ts#L38

```
.map((node: ts.PropertyAssignment) => {
        return JSON.parse(node.initializer.getText(source)); // tslint:disable-line
      });
```

JSON.parse failed with ：

```
loadChildren:'app/+workspace/+settings/settings.module#SettingsModule'
```
