IE8 Fixes (part 2)

Three small fixes here:

* #434 - CSS tweaks: Adding fallback colors for `rgba`, and swapping `::after` for `:after`
* #435 - Enable CORS support in jQuery
* #430 - Click event handler changes
It sounds like you thought I was saying `::after` was proper. I think it isn't, if it ever was. I suspect it was because W3Schools thinks it is <sigh>.