Coltrane

- Add `COLTRANE_IS_SECURE` [env variable](env.mdcoltrane_is_secure).
- Add `django.middleware.gzip.GZipMiddleware`, `django.middleware.http.ConditionalGetMiddleware`, `django.middleware.csrf.CsrfViewMiddleware` middlewares.

- [`django-unicorn`](https://www.django-unicorn.com) integration.
- Fix: Passing `INSTALLED_APPS` into `init` now does not override the default apps.

- Add `DISABLE_WILDCARD_TEMPLATES` setting.
- Add `data`, `slug`, `template`, and `now` to direct HTML template for as much parity to `markdown` content as possible.

- Support directory wildcards.
- Add `paths` template tag.

- Ability to [configure cache](env.mdcache).
- Allow content or data directory to be specified [48](https://github.com/adamghill/coltrane/issues/48).
- Fix: Handle invalid JSON data [48](https://github.com/adamghill/coltrane/issues/48).

- If a markdown file with a slug cannot be found, look for a template with the same slug. Special case for `*.html` which can be a fall-back option to render for any slug.
- Add `raise_404` template tag.
- Add `last_path` template tag.