Finalise the hydiomatic 0.1.0 release

Renamed the __init__.hy files to __init__.py, so that setuptools can
find them, added a NEWS and a setup.py file, and updated
requirements.txt.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
README.md: Added download & version badges

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>