#30 Search for used/un-used keys in a project.

[hwillson]

A new helpful feature would be to add the abilitiy to
tell what keys are actually being referenced by a
project/source code base/etc ... in a particular
resource bundle. I have worked with several bundles in
the past that are filled with garbage, and have
contemplated writing scripts to verify what is actually
used. Adding this functionality to the ResourceBundle
editor would be great! Anyways, just and idea - thanks
for the great product!