Utilize the values from the Timeline object instead of hardcoded durations.

The logic in this module was intended to exist only for the 2014 program
as a temporary hack in order to make the new timeline widget work. Now
that we have the apropriate dates in the timeline model, we can use
those instead of the predetermined durations. Note that this change
also adds a second off season period per TODO, removing the "magic"
of having the offseason actually extend back in time to the program
1 file changed