CloudApp的embedding问题修复了，需要额外后缀，Livid麻烦修复下吧

We've re-enabled embedding. We changed the embed link from "/content" suffix to the actual file name.

For example, the embed link for http://cl.ly/3D90 would have been http://cl.ly/3D90/contet but it's now http://cl.ly/3D90/CloudApp-Icon-512x512.png.

This makes attacks like CloudApp Roulette more difficult (but not impossible by any stretch of the imagination) and has the added benefit of being recognizable by Campfire and forums as an image.