Settings: Development setting to enable navbar (2 of 2)

This adds support for enabling the navbar on devices with
hardware keys.  Intended for developer use and available
via the Developer options menu.

Change-Id: I28afa108533f0508125d23e226dbb74a7029112a
Settings: Battery bar (2/2)

For educational purposes
Based off of: http://review.cyanogenmod.org/#/c/31913/
Change-Id: I714d22b740d1aaa25aee04180cc5e7dd55f363ec

Conflicts:

	res/layout/dialog_color_picker.xml
	res/values/cm_strings.xml
	src/com/android/settings/cyanogenmod/StatusBar.java