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
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Simply do what you normally do to use Candlepin.

NOTE: I did not update Gutterball.
Why are we going with `Object` instead of `String`?  Just so we can add `Integer`, `Boolean`, etc without running `toString()` first?  I'm a little hesitant to just do raw Object since we lose a lot of type safety.  If it's absolutely necessary that we work with Object, I'd rather see this class take an abstract type and then where it is used, declare `ConfigurationParser<Object> x = new ConfigurationParser<Object>`.  That way at least we have the option to use the class in a type-safe manner later on.