Factor out DOM option discovery
Factor out DOM option discovery

This should enable people to use the option code we've provided even if
they don't want to use our initialization method.

pivotal-energy-solutions/django-datatable-view,doganmeh/django-datatable-view,pivotal-energy-solutions/django-datatable-view,doganmeh/django-datatable-view,doganmeh/django-datatable-view,pivotal-energy-solutions/django-datatable-view