django-invitation: Replace "direct_to_template()" with generic template view

This is an edit to the upstream django-invitation package to make it
compatible with Django 1.5.

This is a deprecation documented in Django 1.5 release notes.
django-authopenid: Replace "direct_to_template()" with generic template view

This is an edit to the upstream django-authopenid package to make it
compatible with Django 1.5.

This is a deprecation documented in Django 1.5 release notes.
Replace "direct_to_template()" with generic template view

This is a deprecation documented in Django 1.5 release notes.