Supporting async/await with global Promise definition and tests, issu…

[rorticus]

…e #70

Type: feature

Description:

Adding Promise (and updating types) to the global space so you can use async/await. Also includes tests for using third-party (Bluebird) Promise objects.

Used like this...

import 'dojo-shim/Promise';

function longRunningTask() {
    return Promise.resolve(1);
}

async function doThings() {
    var result = await longRunningTask();
    // do something with result
}

Related Issue: dojo/meta#70

Please review this checklist before submitting your PR:

• There is a related issue
• All contributors have signed a CLA
• All code matches the style guide
• The code passes the CI tests
• Unit or Functional tests are included in the PR
• The PR increases or maintains the overall unit test coverage percentage
• The code is ready to be merged

[codecov-io]

Current coverage is 97.02% (diff: 100%)

Merging #64 into master will increase coverage by <.01%

@@             master        #64   diff @@
==========================================
  Files            30         30          
  Lines          1276       1278     +2   
  Methods          24         24          
  Messages          0          0          
  Branches        248        249     +1   
==========================================
+ Hits           1238       1240     +2   
  Misses           21         21          
  Partials         17         17          

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