Lock geocouch to 3.0 revision; more comments on what should be in 3.0.2

Change-Id: Ia7080836069399e0f647723d13687988c37888c9
Reviewed-on: http://review.couchbase.org/43015
Reviewed-by: Wayne Siu <waynesiu88@gmail.com>
Tested-by: Wayne Siu <waynesiu88@gmail.com>