Front End Work

Lots of work here! Each of the commits in this Pull Request has information about what was done. The tl;dr is that we made lots of UI changes for the better. This has been tested in latest versions of Chrome, Firefox, Safari on Mac and it works in Internet Explorer versions 10+. 

Lower versions of IE will need some extra help, but they account for <10% of users so I think this should get us going for MVP. 

Please pull this down and make sure I didn't catastrophically break any Rails bits, but I think not.

Cheers!
`link_to` will take the link text as the first argument, the block syntax is only for the case where you need to link a complex bit of HTML. This is another candidate for DRYing up:

```haml
- (1..6).each do |i|
  %div{id: "progress-indicator-step#{i}}
    = link_to(i, root_path(user: @user.attributes)
```