 flickSpeedMultiplier = 1
 
 ###
-ScrollElementWithFlick
+ScrollElement
 
 guarantee:
   Will never scroll more than one "windowSize" per frame.

  # Gestures & Event Handlers
  ###################
  # attach scrolling event handlers on init and whenever handlers change
  preprocessEventHandlers: (handlerMap) ->
    merge @_externalHandlerMap = handlerMap,
      mouseWheel:     @mouseWheelEvent.bind @

      createGestureRecognizer
        custom:
          resume:     @gestureResume.bind @
          recognize:  @gestureRecognize.bind @
          begin:      @gestureBegin.bind @

  This part is confusing - end-tracking is rather different than start/child tracking:

    tracking:
      start/null: the start of firstChild   is pinned relative to the start of ScrollElement
      child:      the start of focusedChild is pinned relative to the start of ScrollElement
      end:        the end   of lastChild    is pinned relative to the end   of ScrollElement

    startPosition: top/left
    endPosition: bottom/right
