Make replies work

[Fixing this](http://api.nextgen.guardianapps.co.uk/discussion/comment/27332727.json)

__Error: __
![replisd](https://cloud.githubusercontent.com/assets/31692/3041389/1bca2c9c-e0f4-11e3-8efd-92257836a843.png)

__//CC:__ @Nick-Smith @james-rodgers