Widgetize the design form

Widgetize the design form

Squashed commit of the following:

commit a4610db66974866fdeb98184ce7e2be1470fb4d7
Author: Evan Prodromou <evan@status.net>
Date:   Mon May 31 08:48:35 2010 -0700

    use selfUrl for designform action

commit fd9f46ab33caa2c2d0df90d1d596c7b8c6453ce3
Author: Evan Prodromou <evan@status.net>
Date:   Mon May 31 08:29:43 2010 -0700

    fix design settings syntax

commit d1797ef9f90bf038665463424ad962bfe039c9f0
Author: Evan Prodromou <evan@status.net>
Date:   Mon Nov 9 23:23:53 2009 -0500

    widgetizing design form