Remote game

[maciejSamerdak]

A remote game model must be designed. We must figure how changes in game will be communicated to other palyer, how are players identified, etc.
Player's possibility of making a move must be frozen, until he gets notified from another player, after he finishes his own move.
Some sort of authentication is required.

Should be implemented after #2 and #1

[maciejSamerdak]

This can also be split and probably will. Currently it's all placed in one issue, because it requires further discussion and other features being implemented before we can start working on it.