fix inheritance choice attrib
Add prefetch_related support (with ordering) for select2 m2m field
Bump version to v1.1.15
Fix compatibility bug with django >= 1.4.2
Move version from __init__.py to setup.py
Bump version to v1.1.16
Modify widgets.py to conditionally define _has_changed method depending on Django<=1.6.
Merge pull request #14 from ropable/master

Modify widgets.py to conditionally define _has_changed depending on Django version
Bump version to v1.1.17
Merge pull request #12 from zerc/master

Add `choices` property so that `_get_choices()` actually gets called
Bump version to v1.1.18
Add OneToOneField
Fields.py: Remove excess whitespace
v1.1.19
Merge remote-tracking branch 'upstream/master'