Polymer/ShadowDOM — pull request #233 by arv (2013-08-29 15:42:04+00:00)
Title: Fix issues where we did not update the renderer after DOM changes

- Changing content[select] to more restrictive needs to clean
up non matching nodes (we clear the child nodes now)
- Changes to fallback content needs to invalate
- Adding a content or shadow needs to invalidate

Fixes #226