Added future config options for xpbank
Default experience methods are unreliable

- Implimented ExperienceManager (Formerley ExprerienceUtil)
- Fixed major flaw where bukkit thinks you have a lot more experience
than you actually have.
Updated config.yml

Added more options for the xpbank
Just a few things

- Removed a few empty lines
- fixed major flaw where it thinks you have a lot more XP than you
actually do.
- fixed bug where the wrong message would appear (various reasons)

- The config.yml will now add missing nodes (you no longer have to
delete the whole damn thing)

- Implimented xp banks.
- new permission signranks.create.xpbank
- right click to withdraw
- left click to deposit
- shift+click to transfer all
- XPbanks have limited storage and a set cost to make
- can charge money $, exp, or lvl
- new config option xpbank.cost
- new config option xpbank.storage

TODO:
have disabled signs actually disable