Allow the form_class used by NexusSite to be overriden by a subclass.
Allow the form_class used by NexusSite to be overriden by a subclass.

Raekkeri/nexus,YPlan/nexus,graingert/nexus,roverdotcom/nexus,roverdotcom/nexus,roverdotcom/nexus,YPlan/nexus,Raekkeri/nexus,disqus/nexus,brilliant-org/nexus,disqus/nexus,brilliant-org/nexus,blueprinthealth/nexus,graingert/nexus,disqus/nexus,YPlan/nexus,graingert/nexus,blueprinthealth/nexus,brilliant-org/nexus,blueprinthealth/nexus