[FIX] scaron#156 Browser complains about mixed content

If a site is loaded using https:// youtube videos (and probably
other embeds) will not load because the script hard codes http
in the video URLs

The following fix is as follows:

 - only applies to video urls (any impact on other embeds unknown)
 - checks for the current document protocol (http: or https:)
 - if protocol is file:, then it defaults to
   - http for youtube as it is existing behaviour
   - specified protocol in the vimeo url (new behaviour)

See this fix in action at by clicking the vimeo videos on the
right.

https://www.listcorp.com/asx/ler

js/jquery.prettyPhoto.js

@@ -279,7 +279,8 @@
 								movie_id = movie_id.substr(0,movie_id.indexOf('&')); // Strip anything after the &
 						}
 
-						movie = 'http://www.youtube.com/embed/'+movie_id;
+                  var protocol = document.location.protocol.startsWith('http') ? document.location.protocol : 'http:';
+						movie = protocol+'//www.youtube.com/embed/'+movie_id;
 						(getParam('rel',pp_images[set_position])) ? movie+="?rel="+getParam('rel',pp_images[set_position]) : movie+="?rel=1";
 
 						if(settings.autoplay) movie += "&autoplay=1";
@@ -293,8 +294,9 @@
 						movie_id = pp_images[set_position];
 						var regExp = /http(s?):\/\/(www\.)?vimeo.com\/(\d+)/;
 						var match = movie_id.match(regExp);
-
-						movie = 'http://player.vimeo.com/video/'+ match[3] +'?title=0&byline=0&portrait=0';
+
+                  var protocol = document.location.protocol.startsWith('http') ? document.location.protocol : match[1]+':';
+						movie = protocol+'//player.vimeo.com/video/'+ match[3] +'?title=0&byline=0&portrait=0';
 						if(settings.autoplay) movie += "&autoplay=1;";
 
 						vimeo_width = pp_dimensions['width'] + '/embed/?moog_width='+ pp_dimensions['width'];