Introduce private docs and flatpages preview (#26)

* Add support for private documents
* Fix migrations after merge
* Rebase fixtures
* Filter private decoder docs
* Enable preview of unpublished pages

ram/ram/__init__.py

@@ -1,4 +1,4 @@
 from ram.utils import git_suffix
 
-__version__ = "0.6.2"
+__version__ = "0.6.3"
 __version__ += git_suffix(__file__)

ram/ram/models.py

@@ -14,6 +14,7 @@ class Document(models.Model):
         null=True,
         blank=True,
     )
+    private = models.BooleanField(default=False)
 
     class Meta:
         abstract = True