New version of bootstrap nav walker (refs #1)

  * support for Fonts Awesome
Set menu level/depth to 3 (refs #3)
Show submenu on hover (refs #1)
Bootstrap support for multi level menu (refs #1)

  * new version of Bootstrap v3.2.0
Merge branch 'feature-1-menu' into develop

* feature-1-menu:
  Bootstrap support for multi level menu (refs #1)
  Show submenu on hover (refs #1)
  Set menu level/depth to 3 (refs #3)
  New version of bootstrap nav walker (refs #1)