Config unification

Replace Candlepin's Config class with Configuration from common. No more ```new Config()``` in mainline code, rely on injection of Configuration from Guice.

TEST
---------
Simply do what you normally do to use Candlepin.

NOTE: I did not update Gutterball.
Instead of trying to make it project specific, what if we just make it something generic like ```project.passphrase.path``` where ```project.``` is the prefix? Or even ```common.``` would be ok. Personally I like project. Then any project that uses the common can config can access it or common can get to it as well.