feat(avatars): profile images

Getting there! Feel free to start looking @shane-tomlinson @pdehaan.

Still needs:
- [ ] profile-server client
- [ ] progress indicator screen
- [ ] unit tests for camera view
- [ ] unit tests for cropper widget
- [x] circular overlay on cropper
- [ ] functional tests
We should just pull in a few files from the `ui` directory and not the whole thing: 
![image](https://cloud.githubusercontent.com/assets/128755/3710211/d715dfec-1479-11e4-9e50-d49d0688b170.png)