Feature/make package pip installable from local filesystem

**Story / Bug id:** https://hogarthww.atlassian.net/browse/ZFOUR-337
**Project / App:** cookiecutter-djangopackage
**Reference person:** @christopherdcunha
**Description:** Fix up package so that it is pip installable from the local filesystem. The main goal of this is to make ex-Zadar codebase easier to develop on.

**Migrations:** None

**Rollback:** Revert code

**New imports / dependencies:** setuptools is now required. No fallback to distutils

**Unit Tests:** None

**What tests do I need to run to validate this change:** pip install from local filesystem