Reorder package to src-layout, switch to GPLv2 license.

Move package to src directory and update project base files for build
process.
This project change the LICENSE from GPLv3 to GPLv2 after approval of
all contributors:
https://github.com/kjkoster

Makefile

@@ -0,0 +1,43 @@
+SHELL        := bash
+MAKEFLAGS     = --no-print-directory --no-builtin-rules
+.DEFAULT_GOAL = all
+
+# Variables
+PACKAGE = revpipyload
+
+# If virtualenv exists, use it. If not, use PATH to find, except python3
+SYSTEM_PYTHON  = /usr/bin/python3
+PYTHON         = $(or $(wildcard venv/bin/python), $(SYSTEM_PYTHON))
+
+all: build
+
+.PHONY: all
+
+## Environment
+venv:
+	$(SYSTEM_PYTHON) -m venv venv
+	source venv/bin/activate && \
+		python3 -m pip install --upgrade pip && \
+		python3 -m pip install -r requirements.txt
+	exit 0
+
+.PHONY: venv
+
+## Build, install
+build:
+	$(PYTHON) -m setup sdist
+	$(PYTHON) -m setup bdist_wheel
+
+install: build
+	$(PYTHON) -m pip install dist/$(PACKAGE)-*.whl
+
+.PHONY: build install
+
+## Clean
+clean:
+	rm -rf build dist src/*.egg-info *.spec
+
+clean-all: clean
+	rm -R venv
+
+.PHONY: clean clean-all