Animate sent message bubbles (WIP)

Awful quality preview:

![GIF](https://f.cloud.github.com/assets/124223/2266055/a30c331a-9e8e-11e3-926d-b8d81a2cffbf.gif)

I'm unsure on what the best way to pass the message ID to the adapter (or know what view to animate) would be, so I'm uploading this for comments and pointers. This is also broken in group chats since I don't know how to get the right ID there.