Removed horizontal scrollbar for column divs
Removed background from scrollbar
Added end condition at depth >= 5

- Won't add new columns past 5
- Display message to user that they're done
- Display link to export on end column
- Added fontawesome
End column export button working

- made end column hidden div
- Removed commented code from stylesheets
Restyled nav, added icons.

Removed unnecessary css from styleguide.
Merge pull request #72 from apesic/horiz-scrolling

Added end state at depth >= 5, started nav bar restyle