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.
This means, the _main_ assembly configuration has precedence over the _dll_ configuration. This is perfectly valid and good. We need to document this very clearly.