Merge pull request #60 from Gegga87/master

added Lobby message and LobbyMembership
sync with master
Merge remote-tracking branch 'upstream/master'
Merge pull request #61 from Gegga87/master

Implemented game_info, make_move, get_question, submit_answer towards th...
changed the get friends endpoint to follow the changed spec
Merge remote-tracking branch 'upstream/master'
Merge pull request #62 from ahlen/master

changed the get friends endpoint to follow the changed spec
fixed minor issues that made the lobby crash after changes in the message system
Merge branch 'master' of https://github.com/quizzingbricks/quizzingbricks-core