More generic support for Ooyala Player

This commit adds more generic support for Ooyala Player. It should remove the need for slashdot.py and vice.py (but I will leave that decision up to others), as well as add support for sites that don't follow the usual pattern by searching for "var embedCode" which as best as I can tell is a variable unique to Ooyala Player and shouldn't cause any false positives or conflicts with other extractors.