Fix list appearance in combination with django-grapelli
Bump version to 0.8.4
Improve error message on invalid movements

Based on commits by @psychotechnik
Remove the local polymorphic admin, it's part of django-polymorphic 0.3 now.

As django-polymorphic 0.3 is released with our polymorphic admin code,
the local copy can be removed.

Also marking the app as beta now, as the polymorphic admin API
is now released and accepted as is.
Using django-tag-parser, the tag parsing has been to that app.

This app and the django-fluent-* apps all share the same tag parsing
logic. Now no app holds a local copy anymore.
Remove utils package as it has become obsolete now.

The admin+tag parsing utils have been migrated to other apps.
The JsonResponse turns out to be unused.
Cleanup and modernize setup.py and bump version numbers
Make sure `model.save()` is called when moving models in the admin.
Execute move operations in a single transaction.
Typecast move ID's to long, raise error on conversion issues.
Update actions column on move, to update the preview URL
Bump version to 0.8.6 for admin move fixes
Minor cleanup, return `error: null` in API success call.
Remove deprectiated adminmedia templatetags
Merge pull request #5 from borgstrom/django-1.5

Remove deprectiated adminmedia templatetags (Django-1.5)
Add changelog entry for first change in 0.8.7, 1.5 templates
Merge pull request #1 from edoburu/master

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