Ref. https://github.com/tc39/proposal-regexp-unicode-property-escapes/issues/27.

Ref. https://github.com/mathiasbynens/node-unicode-data/issues/45.
Ref. https://github.com/mathiasbynens/regenerate-unicode-properties/commit/da8ae69b9b8a11be16394d7fa183ccc9d68337db.
Ref. https://github.com/mathiasbynens/unicode-property-escapes-tests/issues/7.

https://github.com/mathiasbynens/unicode-property-escapes-tests/commit/c62ed61cfc7c3c7d596f922facee2c0152555d8f

Proposal: https://github.com/tc39/proposal-regexp-unicode-property-escapes

These tests have been generated by the script at https://github.com/mathiasbynens/unicode-property-escapes-tests. They check all the properties and values that should be supported by implementations against the symbols they’re supposed to match. False positives are detected as well.

Ref. #950.
Ref. https://github.com/tc39/proposal-regexp-unicode-property-escapes/issues/4.

Ref https://github.com/tc39/ecma262/issues/815
Ref https://github.com/tc39/ecma262/pull/889

This is testing the current semantics of the specs, rather than the semantics in the proposed referenced issue.

The `length` property should be [[Configurable]]
https://tc39.github.io/ecma262/#sec-function.prototype.bind

Also the test was testing deleting the wrong property.

Fixes #957.

Update Async-from-Sync Iterator yield* tests

Ordering of done and value property loads changed in
https://github.com/tc39/proposal-async-iteration/commit/395b2e3b2f5acb62f9fae11c5e189423d4af50e6

Introduce configuration to allow build servers provided by the Travis CI
service to execute the test generation tool and commit the resultant
files to the canonical upstream repository.

Enabling this workflow required additional administrative work:

1. Create an account with TravisCI
2. Install the `travis` command-line utility
3. Create a "deploy key" and an encrypted version using the command
   `./make.py github_deploy_key_enc`
4. Register the deploy key with the project's GitHub account
5. Check the encrypted deploy key to the repository
6. Configure the TravisCI service to automatically build this project

* Add Function.prototype.toString tests for many function forms
* Add non-const computed property name to Function.prototype.toString tests
* Split class method tests into class-expression and class-statement tests
* Add tests for unnamed function expression forms
* Add tests for async (generator) methods in class contexts
* Add test case for Function.prototype.toString on async arrow function

Update cases for async arrow fns with a line terminator

After @rwaldron's feedback:

The purpose of the `!` operator is to evaluate an UnaryExpression,
coerce the result to a boolean value and then return the negated
value of that operation. But that's not what you're trying to do at
all—you just want to evaluate the expression to the right of the
operator, nothing more, nothing less. In this specific case, you
don't even really care about the evaluation, the goal is write
valid (or invalid, as the case may be) syntax that is will be
parsed according to a specific grammar rule that requires some
operator to signal that the thing is an expression and not a Block
Statement.

Closes #954

- Insert a missing .next() call
- Avoid overlapping names used in test cases

Case files like `src/dstr-binding/ary-ptrn-elem-ary-elision-init.case` are already setting
bindings named `g`. Renaming them in the templates prevents overlapping names.

[rebased] Update tests to match latests drafts

Tests doesn't use async functionality and don't call $DONE, so remove
"async" flag:
- src/params/error/async-gen-named-func-expr.template
- test/language/expressions/async-generator/params-named-dflt-abrupt.js
- test/language/expressions/async-generator/params-named-dflt-ref-later.js
- test/language/expressions/async-generator/params-named-dflt-ref-self.js

Intl.PluralRules.prototype is no longer a Intl.Prototype instance:
- test/intl402/PluralRules/prototype/prototype.js

Intl.PluralRules throws an error when called as a function:
- test/intl402/PluralRules/undefined-newtarget-throws.js

Module namespace objects call OrdinaryDelete for symbol properties:
- test/language/module-code/namespace/internals/delete-non-exported.js

Async generators no longer retrieves "done" property twice:
- src/async-generators/yield-star-async-next.case
- src/async-generators/yield-star-async-return.case
- src/async-generators/yield-star-async-throw.case

Minor units of CLF is 4, so we need to test with maximumFractionDigits=3
to get an error:
- test/intl402/NumberFormat/dft-currency-mnfd-range-check-mxfd.js

DateTimeFormat.prototype.formatToParts length property was changed from
0 to 1:
- test/intl402/DateTimeFormat/prototype/formatToParts/length.js

minimumSignificantDigits and maximumSignificantDigits properties are
only retrieved once:
- test/intl402/NumberFormat/11.1.1_32.js

Closes #948

Fixes for gh-755, per reviews

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>

Bug was reported by @anba at
https://github.com/tc39/ecma262/pull/852#issuecomment-291781031

Without this change, you'd expect a RangeError rather than a TypeError.