[Build] Update to es6-promise 3.3.0

[VWoeltjen]

...including changes to filename associated with that version.

Fixes #1183

Author Checklist

1. Changes address original issue? Y
2. Unit tests included and/or updated with changes? N/A (changes to build only)
3. Command line build passes? Y
4. Changes have been smoke-tested? Y

[VWoeltjen]

Another option would be to remove the Promise polyfill entirely. PhantomJS 2.1.1 no longer needs it, nor should any evergreen browser.

(Edit: WIP to verify that this would work on branch drop-promise-1183)

[larkin]

@VWoeltjen IE11 doesn't have promise, so we have to keep this around for now. Going to integrate this branch.

[larkin]

Reviewer Checklist

1. Changes appear to address issue? Y
2. Appropriate unit tests included? N/A (build only)
3. Code style and in-line documentation are appropriate? Y
4. Commit messages meet standards? Y