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
This is the proper syntax anyway, AFAIK. http://www.w3.org/TR/CSS2/selector.html#before-and-after