NPCWarehouse

+ Added traders (use '/trader help' for more information)
+ Added gravity to NPCs
+ Added an Auto Updater
+ Added '/npc info' to show information about the selected NPC
* Revised Plugin Metrics
* Fixed Mailmen
* Revised NPC naming and saving
* Fixed MCPC compatibility errors
* Optimized source code and NPCDatabase connections
* Fixed many reported bugs
* Updated settings in config file
* Revamped API
- Temporarily removed '/npc bed' to fix bugs
- Removed unused language settings in config file