[vimeo] Use regexps to find description

This fixes descriptions on 2.6 and makes the code simpler.
[worldstarhiphop] Correct title extraction
[ign] Return proper playlist object
[generic] Fix testcases
[ynet] Fix test checksums
[sportdeutschland] Fix testcase
[generic] Remove unstable test checksum
[facebook] Fix test case
[youtube] Remove swf signature test cases

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