Update for full bank support.

Nearly finished.
Merge pull request #342 from Marenwynn/master

Update lib and economy plugin class for full bank support.
BREAKING CHANGE: abstracted the Economy interface.
resolve merge conflicts with upstream
update pom.xml for new CB version
build against latest beta.  Added missing 1.4.6 items.
revert abstracting the interface.
Merge pull request #8 from MilkBowl/master

sync