finalize renaming to ccd_tools and to a proper versioning scheme
This release is the first 'proper' release on github.com, with the most prominent changes:
- first version under the new name 'Cole-Cole decomposition tools' (CCD)
- first (proper) version uploaded to pypi
- first (proper) Python 3 version
- first version with a DOI (via Zenodo)
- initial homepage with online-documentation