GuildEra

Revision 19:
- Changed the way of detecting houses in guild's to prevent exploiting this mechanism.
- Every hour there is now a chance to spawn a villager, before it was every 6 hours.
- Doubled the maximum villagers in a guild.
- Some of the monsterspawners will spawn mobs slower in new created dungeons.
- You can buy now a 8*8 square to the guild area for the cost of 1 gold block. (.guild expand)
- You can now look up in which guild area you are. (.guild in)
- Iron tools can now be used with lvl 30.
- Redstone related stuff and lightstone is now availabe with lvl 35.
- .guild return now can only be used in the own guild or in free areas.
- Fixed a bug where you could set the rturn point of your guild outside of the guild.