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

FWIW I like the names. To your point, these APIs must operate on a tree, so there's always a question of "before what?" and "after what?". The same questions could be said of insertBefore from a DOM newbie. I use the following logic to figure it out.
1. before = insertBefore, ergo after = "insertAfter"... i.e. a sibling operation.
2. append = appendChild, ergo prepend = "prependChild" a child list operation.

*if* I was considering an alterative short name, I might be inclined towards "next" and "previous" due to their similarity to nextSibling and previousSibling--unfortunately those names are probably also confusing in their own way, not to mention that "next" runs into problems with iterators...

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