Support auto detection of the callers

Currently you have to specify which assembly is used as "internal feeling" source for the Conficius. Imagine you can create Conficius only by saying that you relies on AppSettings and Conficius knows who is asking for information and provides the requested information automatically choosing and reading the related configuration file. This patch introduces such a feature.
_Factory_ is a bit too technical to me. Maybe we can find a better name.