Initial push of implementing new hover states

Hey @arielkennan and @ondrae, a couple questions with this:
1) Wasn't sure if side menu and main menu should have the same characteristics- so I just made them the same for now.
2) Should bottom_links such as on index.html behave like buttons (blue and lighter blue on hover?) or their own thing (darker blue on hover as in original).
3) Are there existing cases for green/blue buttons? I just made new ones.
4) I also didn't see anything existing for the different colored link texts on white backgrounds so I just made new cases.