Rtmp to http fallback

To test:
 - edit ```pages/SiteAmazonCdnMediaManifestPage.php``` and change the port to something out of range like ```123456789```
 - to see the "no HTML5 video message", edit ```www/javascript/site-jw-player-media-display.js``` and short-circuit the ```isHTML5VideoSupported()``` method with ```return false;```.

You may have to delete the ```{hash}_type``` cookie to prevent it from starting with HTML5 video instead of trying RTMP.

Good pages to test:
 - http://blood/course-host-ccme/work-nick/www/course/em-prep
 - http://blood/essentials/work-nick/www/ (needs better styles)

Once this PR is merged, or ready to merge, I'll update the styles on sites that use it.