Pass Nodes to events.add/remove, not Interactables
Add basic support for handling multiple documents
Be more specific about which document to use
Remove redundant context prop on defaultOptions
Move IE8 selection prevention to listenToDocument
Support autoScroll for other-frame Interactables
Add multi-iframe demo
Enable autoScroll in iframe demo
Merge branch 'iframe-support'

Conflicts:
	interact.js