profile page: icon and hover explanation for auths

![screen shot 2014-10-16 at 11 07 00](https://cloud.githubusercontent.com/assets/464192/4660066/df75e788-5513-11e4-9b50-85cc0be3afc5.png)



http://codeguide.co/#html-attribute-order `class` first and if you can squash I'll merge it..