Add media service to image rewriting

Waiting on a NGINX config change for this to go through.
Images from the media service need to be rewritten with `/media` prefixed as discussed with @phamann.

![Cameras](http://gifshost.com/012012/1327341659_lightning_caught_on_camera.gif)
Its fine, better to use `/static` and `/media` just bump up the number of image servers before release.