select the game page by site, board_id

with just board_id, a "multiple objects returned" error is raised,
because it returns games from other sites, too. Even worse, if there is
only one game with this id, and its from an other site, its returned on
the game page for that id.
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