CBD-946:  add 3.0.0 branch which is really master

Change-Id: Id277ae89810a668fad5f2db5c689b9a3ae222c4f
Reviewed-on: http://review.couchbase.org/26643
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>