B.1.4 and Unicode RegExps

Add tests for Array.of

Update tests for Array#find and Array#findIndex

Add and update tests for Array.prototype.fill

Add and update tests for Array.prototype iterator methods.

Add tests for @@iterator

Reinforce test for the use of ToLength(lastIndex) in RegExp

Add and update tests for String.prototype.endsWith

Add tests for String.prototype.startsWith

Add tests for RegExp `u` flag

Add tests for @@isConcatSpreadable

Add tests for String.prototype.includes

Add tests for String.prototype.repeat

Add tests for function `name` attribute

Add tests for RegExp `y` flag

This change set includes tests for most invocations of the
SetFunctionName abstract operation in the ES2015 specification.
Practical testing considerations preclude the introduction of tests for
certain invocations:

- The project is still vetting methods to sustainably test the semantics
  of the Destructuring Binding pattern across all valid productions.
  - 13.3.3.6 Runtime Semantics: IteratorBindingInitialization
  - 13.3.3.7 Runtime Semantics: KeyedBindingInitialization
- Without a loader, there is no way to access a function object declared
  in an ExportDeclaration, so `name` assignment cannot be tested in
  these cases
  - 14.1.19 Runtime Semantics: InstantiateFunctionObject
  - 14.4.12 Runtime Semantics: InstantiateFunctionObject
  - 14.5.15 Runtime Semantics: BindingClassDeclarationEvaluation
  - 15.2.3.11 Runtime Semantics: Evaluation

Extend test coverage for Promise built-in

Previously, test262 had only a test that ensured that ToLength (for
example, rather than ToInteger) was used in test'ing a RegExp, not
in calls to exec. Although in the ES5 and ES2015 specs there is only
one code path, in some implementations, ToLength is called in from
separate code paths. This patch makes a new test for exec'ing a
RegExp and ensures that ToLength is called.

Add tests for String.raw

Add tests for String.prototype.normalize

Fix test regressions

Change license headers to standard format

Add tests for String.prototype.codePointAt

Remove links to hg.ecmascript.org

- Remove duplicate word
- Add missing license