Refactor grid filters to use colander/deform

tailbone/grids/core.py

@@ -898,11 +898,13 @@ class Grid(object):
             data['{}.verb'.format(filtr.key)] = filtr.verb
             data[filtr.key] = filtr.value
 
-        form = gridfilters.GridFiltersForm(self.request, self.filters, defaults=data)
+        form = gridfilters.GridFiltersForm(self.filters,
+                                           request=self.request,
+                                           defaults=data)
 
         kwargs['request'] = self.request
         kwargs['grid'] = self
-        kwargs['form'] = gridfilters.GridFiltersFormRenderer(form)
+        kwargs['form'] = form
         return render(template, kwargs)
 
     def render_actions(self, row, i):