Re: [dom] rename before() and after() of ChildNode (#134)

The problem is that `next`, `previous`, `before` and `after` aren't verbs.

These names historically return booleans. I read `sibling.after(otherSibling)` as `sibling.isAfter(otherSibling)`

Would it be too bad to have `putBefore`, `putAfter` instead? They are nearly as short and they make more sense.

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