Remove files from master, as development will no longer occur there.
The stable branches continue to be supported while they are in
Maintained status.
Updated the README to indicate this change.
Depends-on: Ib186ac5830e5920e264d79be946995e63e960426
Depends-on: I081cd363117671eaab6a3193094d5872f9820354
Depends-on: If2b9a82cddb20543b176ee22765049db257c89b9
Depends-on: I1143e5e5ccf8103e386fe1ce614a554e7f152d9a
Change-Id: I4722b869033ad1bd357e36c4a258b6d3ea61f5d6