Add a custom manager to filter private and unpublished stuff (#39)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* Add support for unpublished objects in roster and consist

* Add support for unpublished objects in bookshelf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/bookshelf/urls.py

@@ -3,5 +3,5 @@ from bookshelf.views import BookList, BookGet
 
 urlpatterns = [
     path("book/list", BookList.as_view()),
-    path("book/get/<str:uuid>", BookGet.as_view()),
+    path("book/get/<uuid:uuid>", BookGet.as_view()),
 ]