Fix django 1.8 support: using get_queryset instead of get_query_set
Fix django 1.8 support: using get_queryset instead of get_query_set

gsong/djorm-ext-pgfulltext,asmedeus/djorm-ext-pgfulltext,barseghyanartur/djorm-ext-pgfulltext,pombredanne/djorm-ext-pgfulltext,ministryofjustice/djorm-ext-pgfulltext,megahall/djorm-ext-pgfulltext,linuxlewis/djorm-ext-pgfulltext