Avoid mixed-content errors if loaded over HTTPS

[cben]

demo: https://cben.github.io/animatable/

[treyhunner]

:+1: I had to use that version because my browser was redirecting to the HTTPS URL

[LeaVerou]

The problem with // is that it doesn’t work locally anymore (over file://) :/

[cben]

Fixed local usage at the expense of non-SNI browsers. IE6 on XP and Android 2.x will probably break, even when loading via http://leaverou.github.io/animatable/. If you care about those, I could make all work with document.location.protocol sniffing.

[cben]

IE6 doesn't render anything useful anyway. Don't have access to [simulate] an old enough android to check. SSL Labs claims android 2.x handshake to github pages does succeed (without SNI).