Use domain-relative src for Vimeo Player in Avia Slideshow

Here’s a simple, more flexible way to reference the Vimeo player to work with sites/pages running under https:// without console errors.

More generally, using // (instead of hard coded http://) should be considered in most places within code where a schema appears.

Please consider this patch below (changing 2 characters). If you need a Git patch then just let me know.

Edit config-templatebuilder/avia-shortcodes/slideshow.php
Go to function avia_slideshow_video_helper()

Change
http://player.vimeo.com/video/'.$video_url
to
//player.vimeo.com/video/'.$video_url

Note that this gets rid of the “mixed content” warnings. However, Vimeo’s CDN’s may still cause a mixed content icon in the browser URL bar, and in the console due to http://vimeo.com/forums/topic:116216 However, Vimeo is supposedly fully supporting https:// video “soon”, so the fix above is in preparation for that inevitability.