Gravatars - cleanup, added to logged in user

* Made the logout button a little less prominent (behind dropdown) and added a gravatar.
* Updated deps
* Fixed collaborator input
* Collaborator gravatar now a circle
* Deleted unused commented code (version control)
* Cleaned up some code where I was working
* Replaced multiple instances of gravatar being done by hand, now use `utils.gravatar`

![screen shot 2014-12-05 at 11 05 59 am](https://cloud.githubusercontent.com/assets/34726/5318554/cb62766c-7c6e-11e4-916b-6eaff2f44807.png)
![screen shot 2014-12-05 at 11 06 23 am](https://cloud.githubusercontent.com/assets/34726/5318555/cb6f832a-7c6e-11e4-8df6-915a6b155cf9.png)