Limit queryset for ForeignKeyAutocompleteAdmin field. Fixes #391
Fixes PolymorphicQuerySet for django > 1.5
Merge branch 'master' into autocomplete_limit
Removed code compatibility for django < 1.4
Set the autocomplete limit value from settings and per ForeignKeyAutocompleteAdmin basis
Merge pull request #405 from django-extensions/autocomplete_limit

Limit queryset for ForeignKeyAutocompleteAdmin field. Fixes #391