Modernized environment

Makefile

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+clean:
+	find . -path '*/__pycache__/*' -delete
+	find . -type d -name '__pycache__' -empty -delete
+	find . -name *.pyc -o -name *.pyo -delete
+	rm -rf *.egg-info
+	rm -rf .cache
+	rm -rf .tox
+	rm -f .coverage
+
+style:
+	flake8
+
+test:
+	python InvenTree/manage.py test --noinput
+
+setup:
+	# TODO: replace this with a proper setup.py
+	pip install -U -r requirements/base.txt
+	python InvenTree/manage.py migrate --run-syncdb
+	python InvenTree/manage.py check
+
+develop:
+	pip install -U -r requirements/dev.txt
+
+superuser:
+	python InvenTree/manage.py createsuperuser