Bears’ Alshon Jeffery knows he needs to keep his temper in check

Bears rookie receiver Alshon Jeffery may have a temper problem. But he promises he’s not going to let it become a bigger problem. Jeffery picked up a 15-yard penalty for a skirmish with Redskins cornerback DeAngelo Hall on Friday night, and while that might be easy to write off as just an isolated incident, it…