CBLT-283:  s3 location: .../mobile/sync_gateway,ios,android/1.0.0/1.0.0-12345

Change-Id: I2c905dcc8b3e94659eb9e281355d34c3e31f122a
Reviewed-on: http://review.couchbase.org/36769
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>