Added support for maximum spawn wave and broadcasts on spawn.
Code cleanup and minor tweaks.
Fixed bug where worldguard regions with mob spawning disabled would disable ZArena spawns.
Fixed bug where if the server crashed in a certain way, it was possible some of the yml files would fail to load.
Updated version to 0.7.5 in the plugin.yml. I forgot to update it to 0.7.4 in the previous update, so that got skipped.