Point 3.0.2 manifest to geocouch master branch

Geocouch has bugs like double encoded values in 3.0.0. This bug and
other bugs were fixed since then. No new features were introduced,
only bugs were fixed. Hence current master should be used for the
3.0.2 build.

Change-Id: I078068bc0f45caab2c703b7844cb42c1603eb3ee
Reviewed-on: http://review.couchbase.org/43100
Reviewed-by: Sriram Melkote <siri@couchbase.com>
Tested-by: Sriram Melkote <siri@couchbase.com>