Added a helper method to InfoExtractor for searching the ‘twitter:player’ meta property.
Now the OoyalaIE also recognizes the ‘ec’ parameter in the url as the embed code.
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.
_search_regex calls the sys.stderr.isatty() function for unix systems.
Py2exe uses a custom Stderr() stream which doesn't have an `isatty()`
function, leading to it's crash.
Fixes easily with checking that it's a unix system first.