Add support for onfoo properties

Wrap all onfoo properties so that the function is called with a wrapped event
object.
Merge pull request #147 from arv/on-event-properties

Add support for onfoo properties
buildbot.git no longer required
Remove .insertionParent
Merge pull request #158 from arv/remove-insertion-parent

Remove .insertionParent
Implement event.path
Merge pull request #160 from arv/event-path

Implement event.path
Make sure webkitCreateShadowRoot calls the polyfill createShadowRoot
Merge pull request #163 from arv/wrap-webkit-create-shadow-root

Make sure webkitCreateShadowRoot calls the polyfill createShadowRoot
adoptNode needs to adopt the shadow root too
Merge pull request #167 from arv/owner-document-of-shadow-root

adoptNode needs to adopt the shadow root too
Ensure we also adopt older shadow roots and shadow roots in the subtree
Merge pull request #168 from arv/owner-document-of-shadow-root

Adopt shadow roots
Fix issue with appending an empty document fragment.
Merge pull request #170 from arv/unwrap-doc-frag

Fix issue with appending an empty document fragment.
Merge pull request #171 from Polymer/master

6/17 master -> stable