Pull nook color commits in from fat-tire and co

Build a uRamdisk if BOARD_USES_MKIMAGE = true

add vfat as EMMC so build will finish.

Change-Id: I4e1424982eb028ceed4603d1bf40b22cec96aacd

this is init.rc fix, part 2

Allow for custom releasetools for devices that may not have traditional boot ad recovery paritions

Change-Id: I0d35535db8cd74505609fa86fcff49167ed8ec63

Fix my fail

Change-Id: I841c7411401be3bb49722fe3ed0c8d20fe18d4bb