MB-12007: Add proper license

GeoCouch is licensed under the Apache License 2.0.

Change-Id: I1986cc622f2ab2c030b3a2873e542a85018c4a9d
Reviewed-on: http://review.couchbase.org/40727
Reviewed-by: Sriram Melkote <siri@couchbase.com>
Tested-by: Sriram Melkote <siri@couchbase.com>