Initial commit of custom UI Mode framework (2 of 2)

Summary:
Round one, we'll bring in force navigation bar. This lays the
core framework for a variety UI mode options including tablet
mode and other navigation possibilities. I'm just getting warmed
up ;D

Change-Id: Icbdb1aab6240a7aef80a9bd1cafb8cbe79f95eb9

Test Plan: give it a go. more win coming

Reviewers: synergy

Reviewed By: synergy

Differential Revision: http://review.codefirex.com/D437