can enchain a game after a game according conditions, playground-362
add associate game and condition, playground-362
add mission game and condition in backoffice, playground-362
add mission game and condition in backoffice in all theme, playground-362
know if mission has associate game, playground-362
know if mission has associate game in all theme, playground-362
Merge pull request #65 from thomaroger/troger-feat-mission-playground-362

[RFR] add mission in backoffice, playground-362