Basic distrubution files into MVC like pattern.
Add example directory and created tennis_model module.

In tennis_model module created TennisPlayer class.
Next it must be created TennisMatch class with custom play_match method.
Finished tennis_model.py. Add method to Score class and its tests.

Finished tennis_model.py for simple tutorial.
To Score class in tournaments.py added method for getting max score
get_max_score(). Into core_test.py added test for this new method.
Add TennisMatchScore class for storing tennis match history for sets.
Created files for tennis view and controller into examples.

Now it will be edited for example usage.
Finished tennis example. Close #10.

Some design errors was fixed for completing example.
Added View for tennis player, some view method changed to static.
Modified import statements, main example file must be in root.
Merge branch 'feat-10' into develop