use js url for safari ( power off plugin mode sucks )
follow up to 624cc2cc63f09622214c86425a778b2fb4489a8a and
3e96be7e807635798d0b06e4c294352a83eed749 consolidate Safari does not
support flash to the actual flash detection method.
Merge pull request #611 from kaltura/safari-vpaid-html

Support VPAID for Safari with JS vpaid