trick vimeo to do html5 embeds on firefox.

somehow the html5 support detection is some sort of broken. by
sandboxing the iframe to not allow access to plugins, vimeo falls back
to html5. nice.

http://stackoverflow.com/questions/12395981/force-vimeo-html5-video-embed#18454686

js/babl/public/index.html

@@ -51,7 +51,8 @@
				re: /https?:\/\/vimeo.com\/([0-9]+).*/,
				fn: function(match) {
					var el = document.createElement("iframe");
					el.src = "http://player.vimeo.com/video/" + match[1];
					el.src = "//player.vimeo.com/video/" + match[1];
					el.sandbox = "allow-same-origin allow-scripts allow-popups";
					el.width = 420;
					el.height = 315;
					el.setAttribute("frameborder", 0);