Game API changings.
Join player after createGame.
Return "alreadyInGame" when exists player with some user_id of user that wants to join game.
Delete game if all players leave.
Check server response after startTesting.
WebSocket port has been changed.
Added sending of tick.
WebSocket tests changes.
Params field at client request.
Sending of tick. Test for tick.
Application tests refactoring due to changes in functions of Game's handling.
Messager changes.
Added params field, HP of player and tick.
Break WebSocket message sending if player is not initialized.
Test_client.html changes.