changed a few misleading refrences to common.py to base.py to better reflect repo
changed a few misleading refrences to common.py to base.py to better reflect repo

tkjone/django-starters,tkjone/django-starters,tkjone/django-starters,tkjone/guides-django,tkjone/guides-django,tkjone/guides-django,tkjone/guides-django,tkjone/django-starters,tkjone/django-starters,tkjone/guides-django