accomodate for new iterator in DOMTokenListPrototype

Created by: hwhw

Starting with Firefox 28, DOMTokenListPrototype defines an iterator function called '@@iterator'. That breaks the assumption that all child objects prefixed with '@' are designed attributes.

For now, we'll just skip operations on child objects prefixed with "@@" (i.e. having a second '@' in string position #1 (closed)).

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