Changing groupId and adding targets for maven central.

Change-Id: I3ebf070eb7a4db6e9a269be60d6bf36905d475cf
Reviewed-on: http://review.couchbase.org/28970
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>