filter.CHILD rewrite
filter.CHILD rewrite

Removed cache for only-child, first-child and last-child, using specific loops to speed up.

Signed-off-by: John Resig <4fe5c7155cbd2f81ef2590764d1a32bc72844862@gmail.com>
npmcomponent/cristiandouce-sizzle,mzgol/sizzle,digitarald/sly,digitarald/sly