Add an automatic page generator for the supported sites (related #156)

They are listed in the "supportedsites.html" page.
[metacafe] Add more cases for detecting the uploader detection (reported in #1343)
Add an extractor for VeeHD (closes #1359)
[vimeo] add support for videos that embed the download url in the player page (fixes #1364)
[vimeo] Handle Assertions Error when trying to get the description

In some pages the html tags are not closed, python 2.6 cannot handle it.
[dailymotion] improve the regex for extracting the video info
[orf] Remove the test video, they seem to expire in one week
Merge remote-tracking branch 'upstream/master'