Updated the version of slf4j used.
Switched logback-classic to be a runtime dependency - it could also be moved to a test dependency and given separately to the PC facade.
Integrated in the jul-to-slf4j bridge, so that any logging again java.util.logging (as is done by guava) is redirected correctly to the slf4j logging.
Added the ability to apply permissions to entire packages.
Added permissions required by Cities and Portals.
Added a permission check on the creation of a ClassMetadata.
Merge branch 'develop' of git@github.com:MovingBlocks/Terasology.git into develop
Cleaned up OrdinalIndicator utility class:
 * Added to API
 * Checkstyle fixes.