By Alek Arend NASCAR has announced a significant penalty for a driver, owner and crew chief. On Thursday, NASCAR announced Brad Keselowski has been docked 100 points and 10 playoff points for modifying a part from a vendor. That’s not all. Keselowski’s crew chief has been suspended four races. 100 owner points are also being docked. This is a significant penalty from NASCAR and one that is bound to garner attention. “Big penalty: Brad Keselowski docked 100 points and 10 playoff points and crew chief Matt McCall suspended for four races for modifying a part from a vendor. Also 100 owner points,…