Add test for render_cache needed behavior
Add test for render_cache needed behavior

CartoDB/Windshaft,manueltimita/Windshaft,wsw0108/Windshaft,HydroLogic/Windshaft,HydroLogic/Windshaft,wsw0108/Windshaft,manueltimita/Windshaft,manueltimita/Windshaft,CartoDB/Windshaft,wsw0108/Windshaft,CartoDB/Windshaft,HydroLogic/Windshaft