BaseColumnsHighChartsView class hierarchy fix
BaseColumnsHighChartsView class hierarchy fix

We now subclass HighChartsView rathern than JSONView and call the
appropraite methods on the superclass for things like context data &
plot options.

Maplecroft/django-chartjs,Maplecroft/django-chartjs,Maplecroft/django-chartjs,Maplecroft/django-chartjs