changed load behaviour in internet explorer and chrome since 2015-06-02

[pmeenan]

The IE 10/11 pre-resolve issue should be tied to a history cache that I could only clear well on IE 7 (which is what the public instance uses).

As far as the change goes, it looks like it's all from early work right around the TLS negotiation (though in IE it looks like it might be before that). That was always a gap with IE that was something in the OS so I wouldn't be surprised if an update fixed it but I have no idea what it was.