Feature Request: Allow dom-modules with shared styles to be used inside Angular2 components.

[alexeygt]

UseCase:

1. I have polymer dom-modules with some custom shared styles published by other team on my project or published by polymer team (like iron-flex-layout/iron-flex-layout-classes.html)
2. I would like to be able to use these styles in some of my Angular2 components.
3. Currently it's not possible to access styles defined within dom-module in Angular2 component.

Example of possible implementation for re-use of iron-flex-layout/iron-flex-layout-classes.html:

@Component({
  stylesIncludeFromPolymer: ['iron-flex', 'iron-flex-reverse', 'iron-flex-alignment']
  template: `
    <div class="layout horizontal-reverse center-justified">
      <div>This div is styled from the Polymer iron-flex-layout-classes.html</div>
      <div>Another div that should be positioned to the left of previous one</div>
    </div>
  `
})

[asyncLiz]

Added to v3:

import { IncludeStyles } from '@codebakery/origami/styles';

@IncludeStyles('iron-flex', 'iron-flex-reverse', 'iron-flex-alignment')
@Component({
  template: `
    <div class="layout horizontal-reverse center-justified">
      <div>This div is styled from the Polymer iron-flex-layout-classes.html</div>
      <div>Another div that should be positioned to the left of previous one</div>
    </div>
  `
})