Made client-side VAST vaguely work.
Parse the VideoAdServingTemplate XML before passing on to third party.
Remove bad Content-Type fallback, now OAS sending correct MIME.
Merge branch 'master' into video-ads
Changed video ad url to PROD
Added tracking for video advert requests
Removed VideoAdvertAgent and moved advert js to common bootstrap
Merge pull request #904 from guardian/video-ads

CORS video adverts