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
![](http://media-cache-ec0.pinimg.com/736x/3d/30/da/3d30da9d84d329cbefdd94eda98bebbd.jpg)