Allow Receipt of Wheel Events in MouseWheelNavigationInterceptor

MouseWheelNavigationInterceptor is not receiving wheel events
event, so it cannot initiate navigation to the next item in the list.
This is due to the automatic cancellation of such events when handled
in EventSynthesizer.

Fix by making the cancellation of wheel events configurable.
Fix jsdoclet
Merge pull request #88 from WebFilings/mousewheel_navigation

Allow Receipt of Wheel Events in MouseWheelNavigationInterceptor