[imdb] Extractor for lists (#2033)
[imdb] Add playlist test
[generic] Output something before making network requests
Add new --print-traffic option
Correct variable name in YoutubeDL
Merge remote-tracking branch 'origin/master'
Merge pull request #2061 from rzhxeo/var

Correct variable name in YoutubeDL.list_formats
 Merge pull request #2041 from dstftw/imdb-list

[imdb] Add support for IMDb list (#2033)
[dreisat] Update test filename and checksum
[youtube] Add itag 264 (closes #2063)

It has a better bitrate than 137 but the same resolution
Merge remote-tracking branch 'origin/master'
[README] Bug reporting: Add an item for unrelated questions
[wistia] Prefer original video format above all others

We could also set up a formula which would weigh filesize/bitrate and vcodec/acodec (say, 1GB h264 < 3 GB MPEG2 < 2 GB h264), but that would get really messy real soon.
[mixcloud] Fix track url transformation (fixes #2068)

‘/previews/‘ must be replaced with ‘/c/originals/‘ now.
[comedycentral] Recognize ‘video-collections’ urls (#2072)