First public release

• relicensed to MIT.
• Breaking API changes:
  • create_new_{component,release,project} now have parameters for required attributes
  • drop support for dump_rest_call() and dump_rest_call_to_file().
  • upload_attachment() has been renamed to upload_release_attachment(). This is to have
    the same naming scheme for the new methods upload_component_attachment() and
    upload_project_attachment().
• New Features:
  • support of the group parameter for the /projects endpoint.
  • SW360 REST API now support project fields 'Project state' and 'Phase-out since'.
  • get_health_status() added.
  • get_project_vulnerabilities() added.
  • SW360Error has new property details.
• Improvements:
  • Debug option to supress session handling.
  • unit tests added.
• published on GitHub.