Deleting CarrierWave since it doesn't support AJAX uploads.
Use Moped GridFS driver for storing files instead.
Clean up attachment to use data from the Upload model.
Clean up to use the Upload model.
Modified for debugging.
Add in support for thumbnails (need to refactor this).
Clean up post route; let upload take care of all this business.
Use Upload model for avatars too.
Add thumbnails tentatively.