NavBar: changed Android L IME back icon for more consistent experience
Conflicts:
	res/drawable-hdpi/ic_sysbar_back_ime_land.png
	res/drawable-xhdpi/ic_sysbar_back_ime_land.png
	res/drawable-xxhdpi/ic_sysbar_back_ime_land.png
	src/com/ceco/gm2/gravitybox/ModNavigationBar.java