Remove code duplication within views relating to the navbar.

This commit does several things:
- Create a helper to determine which page we are on and display
the active class in that li tag accordingly.

- Change the look of the navbar to be inline with the bootstrap navbar
  specs.

- Remove duplication of "navbars" in all pages where duplicated.

- Replace duplication with navbar partial in /layouts

- Move br/ from bottom of pages to layouts for uniformity.

- Change landing page from using a bootstrap thumbnail to a bootstrap
  panel

- Simplies navbar navigation but loses certain nav items, should be
  replaced/addressed in further commits