Renamed a parameter in BukkitUtil.
Added <snapshotRepository> to pom.xml
Prepare for 5.6 release.
Removed the /fill command as an alias of /material.

Fixes WORLDEDIT-3016.
Added EditSession.forestGen() that takes Iterable<Vector2D>.
Added CuboidRegion.makeCuboid(Region).
Added //forest that generates a forest in a selection.

Fixes WORLDEDIT-2958.
Fixed /we help to always check the lowercase command name.

Fixes WORLDEDIT-2876.
Fixed pattern "X%Y" with no Y defined throwing an exception.

Fixes WORLDEDIT-2897.
Updated changelog.