Updated RegExp to check if string is html
Added query() to Document.prototype
Fixed error in $() (htmlString > ufo).
Add comments to see when what happens in $()
Added Element.last() & Element.first().
Fixed Node.text().
Fixed and tested Element.addClass().
Fixed and tested Element.removeClass().
Fixed and tested Element.toggleClass().
Removed extraneous comments and console.logs.
Added own window.getComputedStyle if it does not exist (for IE8 mainly).
Lots of updates and IE8 fixes.
Implemented and tested Element.css().