Added som notes.
First verion of a cvss package.

This change implied a number of other changes
because of source relocation.
Ignore some more files.
Test script refactor.
Documentation updated.
Fixed package to use relative imports.
Updated documentation to reflect both Python 2 and 3.
Updated to clarify installation process.
Merge branch 'feature/stand_alone' into develop
Merge branch 'release/1.20.1'