Corrects document.importNode, fixes #317
Merge pull request #318 from sorvell/master

Corrects document.importNode, fixes #317
importNode needs to traverse the tree
Merge pull request #321 from arv/document-import-node

importNode needs to traverse the tree
Implement inserAdjacentHTML
Merge pull request #322 from arv/insert-adjacent-html

Implement inserAdjacentHTML
Fix outerHTML setter so that mutation observers are notified
Merge pull request #323 from arv/outer-html-mutation-observer

Fix outerHTML setter so that mutation observers are notified