Adds JS Date object

[petele]

No description provided.

[petele]

Note: I did not remove the Date methods from features/draft/spec/ecmascript.yml - can do that if its not automatically updated.

[foolip]

Note: I did not remove the Date methods from features/draft/spec/ecmascript.yml - can do that if its not automatically updated.

No need. #1568 should get the updater workflow running.

[petele]

@ddbeck - updated with group, ready to go.

[ddbeck]

Thank you, Pete!