Recurse into nested resolver namespaces
Recurse into nested resolver namespaces

This fixes named URL patterns nested with depth 2 and above not showing up in
the list of resolvable URLs.

PokaInc/django-js-reverse,BrnoPCmaniak/django-js-reverse,ierror/django-js-reverse,leonardoo/django-js-reverse,bung87/django-js-reverse,chripede/django-js-reverse