select the game page by site, board_id

when selecting with just "board_id", a "multiple objects returned" error
is raised, because it returns games from other sites, too.
implemented GAME_END_TIME
added note about the TIMEOUT parameters.
allow the TIMEOUT Parameters to be None

GAME_SOFT_TIMEOUT, GAME_HARD_TIMEOUT and USER_ACTIVE_TIMEOUT are now
allowd to be None.
style fixes for header/headline
ordering for Word model
moved is_starttime / is_after_endtime to times.py