Added ItemGiving module:
* It adds:
  - /item (/i)
  - /give
  - /giveall
* All of them are in the format of (<minecraftname> [<data> <amount> [<metadata>]]|<item|item:data> [<amount> [<metadata>]])
* /give has an extra <player> parameter at the beginning
* All 3 of them can use either the item id, the bukkit name, the minecraft name, or an alias (from items.csv)
* All of them can apply metadata to the spawned item
* GiveAll will only give to players with the "pandora.giveall.receive" permission