Added Account.verified
Implemented Pin numbers
Fixed problem not letting people change accounts

also implemented pin numbers to BankListener
Fixed verification
Bank accounts now get a random pin assigned

You can always change it later
Minor bug fixes,

Players are no longer told to verify the account while trying to create
a new one. Account must be verified to change pin number.

Features: Typing "account" with no args tells you your account number
Merge pull request #241 from sabersamus/banking

Finished banks, for now