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[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

Allow changes to run under Python 3

Causes DeprecationWarning: http://www.python.org/dev/peps/pep-0352/

video.mit.edu just embeds the videos from techtv.mit.edu

When the url is something like http://example.org/foo/bar?x=y  and the added is file/video.mp4 , we want http://example.org/foo/file/video.mp4
Fixes #1268.