Base manifest for 4.2 GPL components

Change-Id: I7aea272a85e6114a5e9b9b69ee1cfb4e2194dd56
add initial local manifests
add 3.0 manifest for cm11
mb526 switch to cm11 brach
add mb520
add Settings fork
Fixed "repo sync" when no valid github ssh key is configured.
Switch to private android_frameworks_base for pulling in upstream changes