Further cleanup of pom files

The inconvenience I mentioned [earlier](https://github.com/Renanse/Ardor3D/pull/55#issuecomment-21502088) should now be gone.

Also, I merged the duplicated report plugins (which were in the hudson profile) completely to the <reporting> section. This should make more sense. Having them in the build section would only make sense if they actually influenced the build outcome, which was not the case.

And lastly, I made the creation of the source jars the default and not just for releases or the hudson profile. This is useful when deploying snapshots to sonatype, which will probably the future strategy (and getting rid of Ardor3D's own Nexus).