Fix utility methods with dynamic primary key discovery, also some style fixes
Fix utility methods with dynamic primary key discovery, also some style fixes

chris-griffin/django-auditlog,Zmeylol/auditlog,kbussell/django-auditlog,prismskylabs/django-auditlog,johnrtipton/django-auditlog,jjkester/django-auditlog,robmagee/django-auditlog,rauleb/django-auditlog