Merge pull request #10 from heorohuy/master

Fixed broadcastMessage in ArenaData
Started Implementing Mob Configuration

Added classes from Dimensional Doors for reading config files. This is
just a framework - none of the actual functionality is ready yet but the
code from DD will serve as an example for what we want. Also moved
RArenaProperties to rarena.confi package.
Merge branch 'master' of https://github.com/SenseiKiwi/RArena
Fixed Bug in ArenaData.broadcastMessage()

Fixed a bug that would cause NPEs if players were offline. Also made
EventHookContainer.onEntityJoinWorldEvent() only run on the server side.
Merge remote-tracking branch 'upstream/master'