Polymer 2.0 web component example #120

https://github.com/gertcuykens/hello-world
https://github.com/gertcuykens/decorators

I am doing my very best to put the bits and pieces together to present a Polymer 2.0 typescript example. Can you take a look please?

I have many typescript errors I am not sure about.

The polymer team is working on a better typescript experience for custom elements I think the TypeScript team should be involved too in this.

https://github.com/Polymer/polymer/pull/3954/files
microsoft/TypeScript-DOM-lib-generator#150
microsoft/TypeScript-DOM-lib-generator#151

Polymer/old-docs-site#1768