Make sure we call nodeWasAdded_ on all added nodes
Merge pull request #247 from arv/node-was-added-document-fragment

Make sure we call nodeWasAdded_ on all added nodes
Fix test server paths to include observe-js
Merge pull request #248 from azakus/fix-grunt-tests

Fix grunt tests
Replace SideTable with WeakMap
Merge pull request #249 from arv/weak-map

Replace SideTable with WeakMap
Fix insertBefore for IE10.

In `insertBefore(node, undefined)`, `undefined` is not treated as
`null` causing a runtime error.
Make sure we do not remove the shadow dom of nested hosts.
Merge pull request #251 from arv/issue-245-dont-clear-inner-shadows

Make sure we do not remove the shadow dom of nested hosts.
No need to associate node with renderer just to remove stale child nodes.
Merge pull request #252 from arv/remove-useless-associate-node

No need to associate node with renderer just to remove stale child nodes