Bug fixes and user class additions

Fixed two small bugs within the character creator module.
- Name check, was irrelevant to the error message given.
- Undefined index error when no avatar was selected.

Added setMultiple, setStats, setInfo methods in User class.
This allows for the updating of multiple fields in the specified tables.
Eg: $user->setInfo ( 'email' => 'new email', 'password' => 'new
password' );

Added "Stat Test" module, to serve as an example for using these new
methods.
Do not call setMultiple directly, use one of the helper methods (
setInfo, setStats ) to do it for you.