Django-admin-sort

- Use property method `media()` instead of hard coded `Media` class.
- Use the `verbose_name` from the column used to keep the order of fields instead of a
hard coded \"Sort\".
- When updating order in change_list_view, use the CSRF protection token.

- Fixed issue \25:
`admin.TabularInline` problem in Django 1.5.x
- Fixed problem when adding new Inline Form Fields.
- PEP8 cleanup.

- new `position_field` required for inline and modeladmin
- complete rewrite, simplified/robustified
- "rebuild ordering" button in change list, for quick fixes

- Fixed: StackedInlines do not add an empty field after saving the model.
- Added management command to preset initial ordering.

- Refactored documentation for Read-The-Docs

- Fixed: MethodType takes only two attributes