Implement 'maven_build'.

Close #1.
Move tests-folder to top-level directory.
Change packaging to setuptools.
Add setup.cfg.
Update .gitignore.
Update setup.py.

Now it works :-)
Add __main__.py.
Add simple andrimne deploy script.

Performs these steps:
- Uninstalls andrimne
- Builds a dist and uploads it to *test* PyPI
- Installs andrimne from *test* PyPI

Yes, that's a deploy script for a deploy script.