[youtube] Add generator for signature 92
Merge pull request #1068 from MiLk/genalgo-youtube-92

[youtube] Add generator for signature 92
YoutubeIE: add algo for length 90 (closes #1064)

Order the cases from higher to lower length.
Remove the test to signature of lengths 43,43

It's already covered by the test for length 87
release 2013.07.18
Hint that --update may need sudo
InstagramIE: fix the extraction of the uploader_id and the title

The page title is now 'Instagram', so we build it.
Also extract the description
Merge branch 'master' into js-generator

Signed-off-by: Emilien Kenler <hello@emilienkenler.com>

Conflicts:
	devscripts/youtube_genalgo.py