bump to django-reversion 1.4 so this is consistent with the rest of Armstrong
bump to django-reversion 1.4 so this is consistent with the rest of Armstrong

texastribune/armstrong.core.arm_wells,dmclain/armstrong.core.arm_wells,texastribune/armstrong.core.arm_wells,armstrong/armstrong.core.arm_wells,armstrong/armstrong.core.arm_wells,armstrong/armstrong.core.arm_wells,dmclain/armstrong.core.arm_wells