IE8 apparently does NOT support :nth-child, :nth-of-type, :last-child

According to http://quirksmode.org/css/selectors/#t53 these selectors do NOT work on IE8, contrary to what is reported here.
Merge pull request #248 from SimonEast/patch-1

IE8 apparently does NOT support :nth-child, :nth-of-type, :last-child