support IE 8 (sort of), iPhone 3/4, and the original iPad

jQuery 2 borked support for old iOS devices (Object.defineProperty not defined) even though they claim they support it, maybe?

So now going back to jQuery 1.x.

This reverts commit 740393461fefbfe278b90dcf2ec2bb5e8adfa752.
"only supporting IE 9+, since I already made that choice with jQuery, so bump the min version check in master.html"

And makes other changes.

Bootstrap only barely supports IE8, so it's not great. Media queries don't seem to be working, despite using respond.js. The homepage is also totally borked.