Organize data

[jcfr]

For now the CCF version is available on Google drive

The idea would be organize them in https://github.com/BICCN/cell-locator where we would add a CCF-VERSIONS.md file.

Each time a new version of the CCF must be uploaded, a new entry like the following would be added to the file:

* YYYY-MM-DD: Short description
  * file1: sha256
  * file2: sha256

Then a tag named ccf-YYYYMMDD would be created and all files referenced in the new file entry would be uploaded as release assets.

[vovythevov]

Fixed with PR #8