Updated javadocs
Registered PlayerQuitListener
Fixed bug where the whole arena was removed from the HashMap when removing a player from an arena
Implemented VCore
Implemented VCore
Implemented VCore command manager
Implemented VCore command manager
Implemented VCore command manager
Registers commands through VCore
Removed some return statements and fixed bug where the command usage message shows twice
Registered the PlayerJoinListener
Added listener for when a player quits