Adding a generic_filter method for filtering a GFK queryset by a
sub-query of items
Updating the readme
By using a GenericRelation it is possible to greatly simplify querying
across gfks -- this even extends to annotation and aggregation though
the content-type must be filtered for explicitly.
Updating readme
version
Adding fallback methods and tests -- essentially, django will set up the
joins correctly but not the necessary cast if the target PK differs from
the generic foreign key's fk_field (e.g. django comments uses a
textfield) -- which results in a database error.  The fallback methods
handle proper casting.
Bamp
Coalesce since django offers zero by way of sorting nulls last
Adding a fallback filter method because django doesn't handle casting
properly on IN lookups either
Bugfix
Adding test for fallback w/cast
Cleaning up for docs
Adding way to get field db type w/o normalizing
Django 1.4 compat runtests
Removing normalize hook
Fix for MySQL cast expression
Version bump
Update test to clarify / document behavior
Merge pull request #1 from coleifer/master

latest from Charles