Nndownload

- Add support for downloading video series
- Use LF endings on PyPi upload

- Nico's login auth flow has changed, requiring the use of OTP codes in what seems to be most cases. Session cookies (`--session-cookie`) continue to work without requiring this step. A future release will provide a more stable way of storing your session cookie

- Better checks for media availability when downloading videos
- Fixed mylist downloading
- Fixed creation of non-stripped filenames
- Various code cleanup

- Specify index to start list downloads on with `--playlist-start`, e.g. `--playlist-start 39`
- Login using a session cookie value with `--session-cookie`
- Support for downloading Seiga user manga
- Removed `--html5` as all videos are now served on the HTML5 player
- Various bug fixes
- Always download highest thumbnail quality available
- API changes

- Fixes video downloading due to Nico schema change
- Quality detection with --vq/--aq now applies to all videos
- The Flash video player on Nico was retired, so the --html5 flag will be removed soon

- Fixed off-by-one error in file size checking that caused hanging on downloads
- Various other bugfixes