Stop test262 from hanging Spidermonkey with an unimportant error message

Basic coverage for the %TypedArray% object

Replace a ES2015 test where calling the TypedArray constructor with
a floating number triggered a RangeError. Within the ES2016 specs,
the same call will trigger a TypeError, as the result for
`SameValue(NewTarget, here)` will be checked before.

Add tests for iterator expression in ForIn/Of head

Remove files that tested both PerformPromiseThen and
PromiseResolveFunction in favor of new tests that test
PromiseResolveFunction more directly and completely.

Update README.md

Although the `for..in` statement allows Expressions to define the
iterator, only an AssignmentExpression may occupy this position in the
`for..of` statement.

Improve Promise coverage: PerformPromiseAll & PeformPromiseRace

Coverage for length and name function properties

Note: Already uses the updated DataView function lengths from tc39/ecma262#266 (ES2016 Draft 2015-12-20)

Subclassing built-in objects

Improve Promise coverage: NewPromiseCapability

Improve Promise coverage: Promise Reject Function

Improve Promise coverage: Promise.prototype.then

Destructuring Binding - syntax and simple initialization

Add tests for instanceof operator when prototype property is primitive or getter

Object.{values,entries} tests