Fix for issue #136

[hpadmanabhan]

Implicitly rebuild nflgame schedule JSON file when nfldb-update is called with --update-schedules to pick up schedule changes instead of simply just refreshing the database from the existing file as it then requires a separate manual call to nflgame.update_sched to pick up the schedule changes in the interim when running nfldb-update after a gap period.

[BurntSushi]

I understand the problem you're trying to solve, but rebuilding the entire schedule isn't something I want to ever happen automatically. It uses too much HTTP traffic.