Hot fix for dependencies and PyPi package
Created by: Roman223
Hot fix:
- Information for PyPi page was added. Dependencies error (pgmpy) eliminated as well as requirements.txt (no need).
- Methods for saving were renamed/created.
- Setters for structure and parameters were made.
- Small fixes for PyPi comatability.
User should be careful because params validation is not ready, so with any problem from this method user gets uninformative error.