Move SUL dropdown menu to top nav bar

Fixes #365 

![screen shot 2014-07-07 at 10 24 52 pm](https://cloud.githubusercontent.com/assets/1656824/3505502/3e47f740-0660-11e4-82b8-0546b794f98e.png)
![screen shot 2014-07-07 at 10 25 00 pm](https://cloud.githubusercontent.com/assets/1656824/3505503/3fa7b7ce-0660-11e4-9173-291d1dd2d3f6.png)

Positioning of top menu on various sizes can be addressed with #421 
If you add the following to this PR you can also close #421 as @jchristo4 mentions.

    &.dropdown-menu {
      left: auto
    }

Otherwise #421 is going to result in a very small PR to add this.  Perhaps there's something more complicated that @jchristo4 and I aren't noticing, if that's the case, we can :shipit: