Remove netbeans license hint
Relocate all libraries into net.daboross.bukkitdev.skywars.libraries, I didn't realize I wasn't doing this before.

Also, update a few libraries to their release versions.

This was already applied in arena-caching, I'm committing this to develop separately to prepare for a release which doesn't include arena-caching.
Merge branch 'develop' into arena-caching

Conflicts:
	pom.xml