0.6.24 (2018-11-09)

Updated le-utils and pressurcooker dependencies to latest version
Added support for ePub files (EPubFiles can be added of DocumentNodes)
Added tag support
Changed default value for STUDIO_URL to api.studio.learningequality.org
Added aggregator and provider fields for content nodes
Various bugfixes to image processing in exercises
Added is_youtube_subtitle_file_supported_language helper function to support importing youtube subs
Added srt2vtt subtitles conversion
Added static assets downloader helper method in utils.downloader.download_static_assets
Added LineCook chef functions to --generate CSV from directory structure
Fixed the always randomize=True bug
Docs: general content node metadata guidelines
Docs: video compression instructions and helper scripts convertvideo.bat and convertvideo.sh

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