full db matrix in travis and unpin coverall version
full db matrix in travis and unpin coverall version

justquick/django-activity-stream,jrsupplee/django-activity-stream,thelabnyc/django-activity-stream,pombredanne/django-activity-stream,jrsupplee/django-activity-stream,justquick/django-activity-stream,pombredanne/django-activity-stream,thelabnyc/django-activity-stream