New facet field params handling added. 'stats' supported by Solr only for numeric and multivalued fields.
Ajax based range slider. Take 2. Invented search_tags with render_facet tag inside. render_facet takes two args: field_name and field_data. Simply but works at the moment.
Also invented facet widget class for facet rendering. New param 'widget' in OSCAR_SEARCH_FACETS points to that class. If no widget defined default widget will be used.
New render_facet tag added to template.
New parameters added to some facet fields.