Gallery-dl

- Added an `ugoira` post-processor to convert `pixiv` animations to WebM
- Added `--zip` and `--ugoira-conv` command-line options
- Changed how ugoira frame information is handled
- instead of being written to a separate file, it is now made available as metadata field of the ZIP archive
- Fixed manga and chapter titles for `mangadex`
- Fixed file deletion by post-processors

- Added support for:
- `simplyhentai` - https://www.simply-hentai.com/ ([#89](https://github.com/mikf/gallery-dl/issues/89))
- Added extractors for
- `pixiv` search results and followed users
- `deviantart` search results and popular listings
- Added post-processors to perform actions on downloaded files
- Added options to configure logging behavior
- Added OAuth support for `smugmug`
- Changed `pixiv` extractors to use the AppAPI
- this breaks `favorite` archive IDs and changes some metadata fields
- Changed the default filename format for `tumblr` and renamed `offset` to `num`
- Fixed a possible UnicodeDecodeError during installation ([86](https://github.com/mikf/gallery-dl/issues/86))
- Fixed extraction of `mangadex` manga with more than 100 chapters ([84](https://github.com/mikf/gallery-dl/issues/84))
- Fixed miscellaneous issues for `imgur`, `reddit`, `komikcast`, `mangafox` and `imagebam`

- Added support for:
- `smugmug` - https://www.smugmug.com/
- Added title information for `mangadex` chapters
- Improved the `pinterest` API implementation ([83](https://github.com/mikf/gallery-dl/issues/83))
- Improved error handling for `deviantart` and `tumblr`
- Removed `gomanga` and `puremashiro`

- Added support for custom OAuth2 credentials for `pinterest`
- Improved rate limit handling for `tumblr` extractors
- Improved `hentaifoundry` extractors
- Improved `imgur` URL patterns
- Fixed miscellaneous extraction issues for `luscious` and `komikcast`
- Removed `loveisover` and `spectrumnexus`

- Added extractors for
- `nhentai` search results
- `exhentai` search results and favorites
- `nijie` doujins and favorites
- Improved metadata extraction for `exhentai` and `nijie`
- Improved `tumblr` extractors by avoiding unnecessary API calls
- Fixed Cloudflare DDoS protection bypass
- Fixed errors when trying to print unencodable characters

- Added extractors for `artstation` albums, challenges and search results
- Improved URL and metadata extraction for `hitomi`and `nhentai`
- Fixed page transitions for `danbooru` API results ([82](https://github.com/mikf/gallery-dl/issues/82))