Silence warning about MIDDLEWARE_CLASSES when running tests under 1.7.
Bump version to 2.1.0.
Bump version to 2.2a1.
ASCII-fold changelog, again. Fixes GH-141.
Bump version to 2.1.1a.
ASCII-fold changelog, again. Fixes GH-141.
Bump version to 2.1.1.
Bump version to 2.1.2a1.
Merge branch '2.1.x'

* 2.1.x:
  Bump version to 2.1.2a1.
  Bump version to 2.1.1.
  ASCII-fold changelog, again. Fixes GH-141.
  Bump version to 2.1.1a.

Conflicts:
	CHANGES.rst
	model_utils/__init__.py
Revert "Use a signal handler instead of patching save."

This reverts commit 3496fe42916696db36d799facfbf56f9caaa5035.
Add Changelog entry for revert of GH-130; bump version to 2.2.
Bump version to 2.3a1.