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
No, I'm just saying that `:after` is correct and I don't know why `::after` was here to begin with. If that was once the syntax, I never knew it.