Merge pull request #126 from Tradeshift/master

onload in iframes + isolate event registration
Merge pull request #127 from Tradeshift/master

Updates
Merge pull request #128 from Tradeshift/master

Fixes
Use gui.Observer to spiritualize WebKit

Hotfix missing support for innerHTML and friends. Spirits now attach
*async* when native DOM setters are used...
Merge pull request #129 from wiredearp/master

Use gui.Observer to spiritualize WebKit
Still allow WebKit to spiritualize sync

- using gui.DOMPlugin, although we're now crawling the DOM twice when
native DOM setters come into play ...