SW-8 Suggest a scheme of 'Mapper'

This pull request fixes the following issues, please read them to understand this implementation better:
- SW-8 Suggest a scheme of 'Mapper'
Proposed solution is available on issue page #11.

- SW-13 Implement additional methods for Reflections.class
You can read more about this implementation on issue page #19 .

@lstypka can you share your opinion on those?