fixes #703
Merge branch '703-ie9-frame-hasfocus' of https://github.com/paglias/knockout into paglias-703-ie9-frame-hasfocus
Retain ownerDocument support
Add comment to record why we have a try-catch around activeElement access
Merge pull request #893 from SteveSanderson/paglias-703-ie9-frame-hasfocus

Paglias 703 ie9 frame hasfocus