Allow usage of polymer elements with angular2

[jakemac53]

We need to do some work to make angular2 compatible with Polymer.dom.

cc @justinfagnani

[jakemac53]

similar to Polymer/polymer#1405

[justinfagnani]

I can write up the layer pretty quickly. Just need a place to put it.

[Bzik]

It' would be great :)

[zoechi]

See also angular/angular#5531
Enabling full shadow DOM fixes some (many/most/all?) related issues. At least it looks good in Chrome. Haven't tried with other browsers.

[jouni]

We’ve been working on making any Polymer element work with Angular 2 nicely. Check out https://www.npmjs.com/package/@vaadin/angular2-polymer and tell us how it feels.

The quick user guide is here: https://github.com/vaadin/vaadin-core-elements/blob/master/docs/angular2.adoc

We also have a full blown tutorial in the works, you can read it here: https://github.com/vaadin/angular2-polymer/blob/d4581e8fd82841eea84ef40e16e262a12ee4b082/docs/tutorial.adoc

It’s still an alpha release, so there might be some things not working as expected. Better shady DOM support is waiting to be merged from a separate branch: https://github.com/vaadin/angular2-polymer/tree/feature/polymer-dom-adapter

Eventually, the documentation should published at https://vaadin.com/docs/