Some doc improvements
add unique widgetId property, fixes #109
KeyNav: remove need for subclass to set this.containerNode
Increase timeouts for loading HTML files, and disable mobile tests.
Even with the increased timeouts, runsauce.sh still hangs on android / iOS.
Refs ibm-js/deliteful#38.
Since this._savedTabIndex might be 0, use "_savedTabIndex" in this.
Fixes #115.
Use document.registerElement() rather than document.register().
Matches latest spec.  Fixes #114.
Rename createdCallback(), enteredViewCallback() to created(), enteredView().
Matches latest spec.   Refs #114.