Merge branch 'master' of git://github.com/couchbase/goxdcr into HEAD
Also remove code managing gometa service

Change-Id: If82ff1a713907f37f2403307ac3ca8195051ff36
Reviewed-on: http://review.couchbase.org/43880
Reviewed-by: Xiaomei Zhang <xiaomeizhangatwork@gmail.com>
Tested-by: Yu Sui <ysui68@gmail.com>