* No longer use trait but static methods due to lack of Dependency
Injection.
* Adjust all calls.
* Also don't use yield any longer but return array of file names.
Relates: #42
* Make option trait cleaner, remove duplicate logic and use methods for
same logic.
* Also fix issue in readme pointing to non existing config name.
Relates: #42
* To provide a way to adjust deprecations without touching standard.
* Provide an option defining the path to lookup the configuration files.
* Parse yaml files containing deprecations.
Relates: #33
