Yoti-python-sdk

Changed
- Remove unused `YOTI_VERIFICATION_KEY` variable

Changed
- Allow empty profiles

Fixed
- Files other than Python source code are now correctly included in bdists.

Changed
- Various improvements to Django Plugin regarding e.g. templates and URLs.

Added
- Flask plugin.
- Django plugin.

Fixed
- Stripping the PKCS5 padding works correctly on Python2 now.

Added
- Initial SDK release.