Update version to 1.3-SNAPSHOT
Hook up new staging client + progress monitor.  Works, but output is a bit ugly.
Update build configuration, pending some more clean up.
Drop pointless javadoc annotations.
Update SingleV2RoundtripIT to drop.
update build file to use properties
Allow ant tasks to work with v2 and v3 service.
Merge pull request #9 from sonatype/nx24-staging

Updates for NX 2.4