Bug 471713 - Part 5: Add documentation for operators and stack.  r=jwalden

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extra : rebase_source : 4774a7b194cc4c172ee6fcf153fcae18db0c13b6
Bug 983053 - Don't suppress-deleted-elements on an object that's not in the middle of iteration.  r=jorendorff

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extra : rebase_source : 3cd83274ff2050c864411ddf81ff9e74b0a8dfbe
Bug 918987 - Implement String.prototype.normalize.  r=jwalden

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extra : rebase_source : c634fd1961c1eb004bc4e0dd9ed26047abb285b4