Updated cursors to stand alone and not depend on a custom queryset.

Signed-off-by: Kevin Stone <kevinastone@gmail.com>
Added implicit tokenization of cursors when cast to a string.

Signed-off-by: Kevin Stone <kevinastone@gmail.com>
Added default ordering to test both explicit and default ordering in cursors.

Signed-off-by: Kevin Stone <kevinastone@gmail.com>
Added reversing cursors.

Signed-off-by: Kevin Stone <kevinastone@gmail.com>
Added playground test script for interactively experimenting with the api

Signed-off-by: Kevin Stone <kevinastone@gmail.com>
PEP8 cleanup

Signed-off-by: Kevin Stone <kevinastone@gmail.com>
Removed references to previous cursor since it doesn't slice properly.

Signed-off-by: Kevin Stone <kevinastone@gmail.com>