bump client version to allow update
Add update and edit routes, use build_dict_for_post on update form

Also includes changes to build dict for post to make update work.
Many changes to stagecraft to make this work have already gone in.
Add method to convert get response to form. Add hidden id.

The testing around this shows that the convert into a form and back out
into a post dict does not lose important info.
Add sensible create form things for the update case.