Add tests for getGames action
Merge branch 'master' into testing_platform
Fix problem when createGame request was sent before running test on createGame
Add tests for joinGame action
Fix bug in leave_game.
Add game engine and current games storage.

Games storages stores game objects that incapsulate all functionality
and information for each game process.
engine.py incapsulates game physics and gaming process nuances.
Add tests for leaveGame action and fix two small typos
Merge branch 'testing_platform'