Split out a BaseAppCache, make AppCache borg again, add _meta.app_cache
Rest of the _meta.app_cache stuff. Schema tests work now.
Adding a dependency graph class and tests
Merge branch 'master' into schema-alteration
First phase of loading migrations from disk
Add root_node and leaf_node functions to MigrationGraph
Do some basic testing of the recorder
Make a start on operations and state (not sure if final layout)
Recommend using the bcrypt library instead of py-bcrypt

* py-bcrypt has not been updated in some time
* py-bcrypt does not support Python3
* py3k-bcrypt, a port of py-bcrypt to python3 is not compatible
  with Django
* bcrypt is supported on all versions of Python that Django
  supports
Fixing a minor spelling mistake in the queryset documentation
Merge pull request #1064 from Wilfred/master

Minor spelling fix
Merge pull request #1039 from cannona/master

Clarified what unique_for_date considers
Merge pull request #1062 from dstufft/switch-bcrypt-recommendations

Recommend using the bcrypt library instead of py-bcrypt
Fixed #19934 - Use of Pillow is now preferred over PIL.

This starts the deprecation period for PIL (support to end in 1.8).
Removed unicode literals from PIL compat.
Fixed #20165 - Updated testing example to use django.test.TestCase.

Thanks Lorin Hochstein.
Improved the timezone middleware example slightly.

This change avoids having the timezone leak from a request to the next.
Don't unregister OSMGeoAdmin, other tests rely on it.
Fixed previous commit. (Don't commit from DjangCon!)
Fixed #20413 - Respect Query.get_meta()