use viewset to filter queryset
start on add_lookups
merge changes from master
also search for myapp.rest in autodiscover (see #12)
option to request config together with models

(to avoid potentially ambiguous contenttype lookup; see #21)
restore ability to change pagination via URL
don't create negative depths
support config for models not added to pages
split set_selected out into a function
remove "ViewSet" from template name
render None as '' for consistency with wq/template.js
order files by name
use rest.py registration in apps (see #12)