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.
They are identical. And I think the problem was with the Map<String, Object>. Now that we're returning Map<String, String> I changed the method to simply call the one that returns the map.

```
        Properties p = new Properties();
        p.putAll(getNamespaceMap(prefix, defaults));
        return p;
```

That seems to work and we're only iterating in one place.