Feature/rest gamehist service

@Mequrel , @mgruszka , @p4r4noj4 , @Adebski please verify. 
In my personal opinion, we should store players initial positions in map dictionary from https://confluence.iisg.agh.edu.pl/display/ietanks/Front-end 's /api/game/{gameId} POST method, because events store only relative position changes. This should be discussed with fron-end guys @p4r4noj4 , @mgruszka .

It was my suggestion - it is temporary solution to avoid static method call to the factory (like it was in previous state of the PR). After @lasak  PR is merged I think we can restore the state from before - BoardDefinition will contain information about obstacles then.