Wagtailnest

- Fix WTNPageSerializer.serializer_field_mapping bug
- Update changed SHA256 for pluggy in Pipfile.lock

- Stop trying to decode a `str` object

- Move to wagtail 2.0
- Move to pipenv + setup.cfg (until pip10+flit)
- Remove pyup

- Adds redirects to wagtail API
- Update requirements
- Fix port configuration in setup_skeletons
- Update MANIFEST to re-include templates

- Update for django 1.11.7
- Make serve and redirect views configurable
- Move endpoint settings into API_ENDPOINTS dict (backwards incompatible change)
- Update for dj-core-drf 0.0.8

- Revert to using dj-core['defaults'] in defaults