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