enriching pom and adding javadoc and sources generation.

Change-Id: Ifc8f4769c41378948cad4e24827894c0daff7cca
Reviewed-on: http://review.couchbase.org/37501
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>