Update ES6-Promises library to new version that minifies correctly.

@rev byao@
@bug W-2432296@
Merge branch 'ksecretan/master-pending-minify-ES6-Promises' of git.soma.salesforce.com:ksecretan/aura into bob/master-pending/pr143-es6promise-update
Merge branch 'bob/master-pending/pr143-es6promise-update'