Add gravatar images

* Move check-ins above feedback
* Pull javascript out into js files
* Add a css file to style an on-hover tooltip containing the coach email
* Pull gravatars instead of just emails
* Add a function that allows MD5 hashing of emails required for pulling gravatar images
* Make it looks sexy mmm
![screen shot 2014-11-03 at 10 19 00 pm](https://cloud.githubusercontent.com/assets/2602872/4895524/fae3405c-63ea-11e4-916e-e54367a179e8.png)