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add support for "-f mp4" for YouTube

defense.gouv.fr

In some pages the html tags are not closed, python 2.6 cannot handle it.

They are listed in the "supportedsites.html" page.

[youtube] Fix typo in the _VALID_URL for YoutubeFavouritesIE, it was intended to also match :ytfavourites

Only appears sometimes, nearly identical to length 86.

Fix orf.at extractor by adding file coding mark

Make find_xpath_attr also accept numbers in the value

Fix MIT extractor for Python 2.6

Like in "<meta charset='utf-8'/>"

The HTML for the MIT page does not parse cleanly for Python 2.6 due
to script tags within an actual script element.  The offending piece
is inside a comment block, so removing all such comment blocks
fixes the parsing.

Conflicts:
	youtube_dl/utils.py