added an IE and test for traileraddict.com
[youtube] Warn if URL is most likely wrong (#969)
[update] Add package manager to error message (#959)
Separate downloader options
Merge remote-tracking branch 'yasoob/master'

Conflicts:
	youtube_dl/extractor/__init__.py
YoutubeIE: extract the correct video id for movie URLs (closes #597)
YoutubeIE: use a negative index when accessing the last element of the format list
[youtube]: add YoutubeShowIE (closes #14)

It just extracts the playlists urls for each season
Sort IEs alphabetically in --list-extractors
Merge branch 'master' of github.com:rg3/youtube-dl
Add --list-extractor-descriptions (human-readable list of IEs)
Shorten --list-extractor-descriptions to --extractor-descriptions
GenericIE: match titles that spread across multiple lines (related #904)
Add InstagramIE (related #904)
Merge branch 'master' into use-other-downloaders