Handle Mouse Wheel Start and End Events

Handle these events in the EventSynthesizer and publish
`onInteractionStarted` on mouse wheel start events and
`onInteractionFinished` on mouse wheel end events. This allows
consumers to have consistent experience through those events whether
on touch or desktop.
Update bower.json to Point to Requisite wf-common Commit
Merge pull request #10 from WebFilings/interaction_started_finished_on_mouse_wheels

Handle Mouse Wheel Start and End Events