[vimeo] Fix pro videos and player.vimeo.com urls

The old process can still be used for those videos.
Added RegexNotFoundError, which is raised by _search_regex if it can't extract the info.

youtube_dl/utils.py

@@ -572,6 +572,11 @@ class ExtractorError(Exception):
         return u''.join(traceback.format_tb(self.traceback))
 
 
+class RegexNotFoundError(ExtractorError):
+    """Error when a regex didn't match"""
+    pass
+
+
 class DownloadError(Exception):
     """Download Error exception.