[TeacherTube] add user + collection, removed classrooms
[vk] Add support for more URL formats (#3172)
[vk] Add support for mobile URLs
[ivi] Add support for embedded URLs
[vk] Better support for embeds
[generic] Add support for ivi.ru embedded player
[GooglePlus] fix video title extraction
Merge branch 'master' of github.com:rg3/youtube-dl