For asynchronous tests, the contract between test file and test runner
is implicit: runners are expected to inspect the source code for
references to a global `$DONE` identifier.

Promote a more explicit contract between test file and test runner by
introducing a new frontmatter "tag", `async`. This brings asynchronous
test configuration in-line with other configuration mechanisms and also
provides a more natural means of test filtering.

The modifications to test files was made programatically using the
`grep` and `sed` utilities:

    $ grep "\$DONE" test/ -r --files-with-match --null | \
        xargs -0 sed -i 's/^\(flags:\s*\)\[/\1[async, /g'
    $ grep "\$DONE" test/ -rl --null | \
        xargs -0 grep -E '^flags:' --files-without-match --null | \
        xargs -0 sed -i 's/^---\*\//flags: [async]\n---*\//'

add more tests of Promise.all

additional Promise test

add tests of Promise.prototype

add some tests for Promise.race

additional Promise tests

add Promise.reject and Promise.resolve tests

correct test description

rename badly-named files

use current license and minor style cleanup

correct understanding of undefined as thisArgument

incorporate line notes

Is this enough to make a constructor in ES6?

more accurate use of resolved,fulfilled etc.
remove some redundant tests
add new tests

remove "constant array" unclear language

better description

Update S25.4.2.1_A3.2_T1.js

address dangling ()

changes per @anba line notes
 - if GetIterator is abrupt, the Promise.race / Promise.all should reject
 - if Promise.race is called with nonconforming constructor as 'this',
   TypeError should be thrown (cannot reject if exeption is thrown from
   NewPromiseCapability; no promise exists yet...)

correct description of "this" testing in callbacks

fix whitespace, formatting

remove tab
add "next-turn" checking to sequencers

This commit normalizes the test case format used across test262. It applies the following transformations:

* Convert to YAML for frontmatter
* Remove of trailing whitespace
* Replace /r/n with /n except in chapters 6 and 7.
* Copyright header always uses // comments
* new includes attribute replaces $INCLUDE
* No implicit assumptions about test environment other than $ERROR. Everything else appears in the include array. This includes "runTestCase" which is now included in a substantial number of tests.

doneprintHandle.js: make $DONE accept any falsy argument as meaning 'pass'
PromiseHelper.js: checkSequence: new helper fn for async tests
.gitignore: port .hgignore to .gitignore syntax
test262.py: support $INCLUDE directive in python test runner

S25.4.4.1*: tests to cover Section 25.4.4.1, Promise.all( iterable )
A1.1: Promise.all is callable
A1.2: Promise.all expects 1 argument
A2.1: Promise.all([]) is a Promise
A2.2: Promise.all([]) is resolved immediately
A2.3: Promise.all([]) is resolved with a new empty array
A3.1: Promise.all expects an iterable argument