CCBC-398: Provide stability attributes for all APIs

Change-Id: Ie91a1b48ae30fef10d887bc3c0ac79d779301cbb
Reviewed-on: http://review.couchbase.org/36543
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>