Icon Font Refactor

Hello again. I found that most of the icons from the FontAwesome Set in Icomoon are a few pixels off. I've now used other icons from the main 'IcoMoon - Free' Set. I really love FontAwesome but unfortunately we have this bug in the icomoon version. I also did a little bit of cleanup in the _icon-font.scss.
![Socials Before/After](https://cloud.githubusercontent.com/assets/6717303/4258098/601630bc-3acc-11e4-937a-005258ccec82.gif)