v0.0.6: Html.Action works again, new editor feature.

- Added the ability to set the editor to generate a sub-action for the
property's editor / display.
- Fixed the Html.Action issue with a (frankly poor) patch to some of the
lower level code. This needs re-thinking, but I prioritised fixing the
functionality.
- Added the ability to "link" Deferreds, to try and avoid having the
onComplete handlers doing "if (result instanceof deferred){}" checks all
the time.