Add a custom manager to filter private and unpublished stuff (#39)

* Implement a customer manager for flatpages

* Implement public manager for private objects

* Add support for unpublished objects in roster and consist

* Add support for unpublished objects in bookshelf

* Update filtering on REST views

* Use uuid in urls.py

* Increment version

ram/ram/managers.py

@@ -0,0 +1,19 @@
+from django.db import models
+from django.core.exceptions import FieldError
+
+
+class PublicManager(models.Manager):
+    def get_published(self, user):
+        if user.is_authenticated:
+            return self.get_queryset()
+        else:
+            return self.get_queryset().filter(published=True)
+
+    def get_public(self, user):
+        if user.is_authenticated:
+            return self.get_queryset()
+        else:
+            try:
+                return self.get_queryset().filter(private=False)
+            except FieldError:
+                return self.get_queryset().filter(property__private=False)