`this`-related changes + new String.normalize overload#8515

Merged

mhegazy merged 4 commits intomicrosoft:masterfrom

Arnavion:lib-d-ts-fixes-3

May 9, 2016

Commits on May 7, 2016

{Map, WeakMap}.set and {Set, WeakSet}.add return `this`.
Arnavion
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{Array, TypedArray}.{copyWithin, fill, sort} return `this`.
Arnavion
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Add string literal union type overload for String.normalize parameter.
Arnavion
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Update tests and baselines.
Arnavion
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