Set fields->widgets mapping as a constant, rewrite
widget_from_django_field accordingly.
Add some docstrings in ModelResource
ModelResource: Fix existing docstrings indentation (and max-line
length), edit class docstring
Indentation and max-line length fixes
Rewrote ModelDeclarativeMetaclass.__new__, defined generic actions in
private functions, delete (GC) temp lists

Also begins to move ALL references to Django internals (mostly _meta) to
small private functions, will provide easier transition if Django
changes their internals.
Add TODOs, FIXMEs, and TOFINDs (personal comments that I use when trying
to understand the code)
Add docstrings, TODOs, remove useless variable
Merge branch 'master' of github.com:bmihelac/django-import-export

Conflicts:
	import_export/resources.py
Docstring indent fixes
Simplify modelresource_factory
Add comments, and GC temp list