Add multiple trash can support, restoring and complete source object manager and queryset method substitution

apps/common/managers.py

@@ -0,0 +1,24 @@
+from django.db import models
+
+
+class CustomizableQuerySetManager(models.Manager):
+    # FROM: https://gist.github.com/2587518
+    # AUTHOR: https://gist.github.com/fission6
+    # http://docs.djangoproject.com/en/dev/topics/db/managers/#using-managers-for-related-object-access
+    # Not working cause of:
+    # http://code.djangoproject.com/ticket/9643
+    use_for_related_fields = True
+
+    def __init__(self, qs_class=models.query.QuerySet):
+        self.queryset_class = qs_class
+        super(CustomizableQuerySetManager, self).__init__()
+
+    def get_query_set(self):
+        return self.queryset_class(self.model)
+
+    def __getattr__(self, attr, *args):
+        try:
+            return getattr(self.__class__, attr, *args)
+        except AttributeError:
+            return getattr(self.get_query_set(), attr, *args)
+