Fix Firefox bug

Changed default host in demo app to avoid "Blocked loading mixed active content" errors on Firefox 23+

Someone pointed out that the current Pelias demo doesn't work on newer versions of Firefox at SOTM-EU.

This is due to 'Mixed active content' warnings; basically the same thing MS Exploder used to do; when the page is served via `HTTPS` and some content is `HTTP` then it silently fails.

I think this patch should fix the issue although I didn't test it, can someone please do a quick code review, merge & release?