Add async/await ES5 example with regenerator

[piotrwitek]

It is possible to use async/await transpiled to ES5 with only TypeScript and Regenerator with this setup.
Don't need to add Babel in to workflow.
I'm successfully using it in my commercial closed source project, that's working even for IE 10+, with just Promise polyfill.
I'll add example in next release.
Link to my explanation on TypeScript ES6 Generator support thread:
microsoft/TypeScript#1564 (comment)

[piotrwitek]

added regenerator
example code in progress

[piotrwitek]

examples available in my other repo, - need to copy them
https://github.com/piotrwitek/react-currency-converter/blob/master/src/components/main.tsx