WORLDGUARD-2293 - Reported by pr4w

Hey,

With the amount of quests/dungeons available now, that are getting better and better with the new CommandBlocks, a flage for limiting the amount of people to enter a region would be pretty cool. That was people can't cheat on quests/dungeons and won't spam/glitch scripts that are setup.
eg /rg flag NAME max-users 2