npm / cli / #884

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Support multiple set/get/deletes in npm config

While digging into #2300, I realized it would be a lot easier if we
could do this:

    npm config set email=me@example.com _auth=xxxx

and avoid the whole issue of what gets set first.

Also, why not let `npm config get foo bar baz` return just the keys
specified?

Also updates the docs, including the statement that `npm config set foo`
with no value sets it to `true`, when as far as I can tell, that has
never been the case.

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