Update doc to use cm-12.0 instead of 11.0 for cm-12.0 branch

Change-Id: Icfc92fb373506be24b6d73c2235dacca49acc640
Update manifest for cm-12.0

Change-Id: Ic9285dc8b2d04549636da5b57b0f003b5d850302
Merge branch 'cm-12.0' of https://github.com/CyanogenMod/android into cm-12.0

Conflicts:
	README.mkdn
	default.xml

Change-Id: I2f6ec147f1705d8f59de0a5185dc20be77696a1f