Dash - It should be possible to vertically scroll the Dash left clicking and dragging

Should be able to use the new nux::Flickable component for this (when it lands).

Need more info from design:

John - I don't think it's a good idea to restrict the dragability to just the "empty areas". All other touch UIs in common use, and even the Unity Launcher, allow you to drag even grabbing the icons themselves. It's just a matter of how long you hold the initial click/touch that determines if you're dragging an icon or the whole surface.

@John,

Could we get a decision on this one please, someone might work on it this cycle.

@om26er; I'm leaving this as incomplete for now because of other Dash changes that we are in the process of making, and because @vanvugt's good suggestion of not limiting the action to just the area's in between the icons introduces possible conflicts with drag and drop actions which will need to be managed, increasing the amount of work required to fix the issue. We will come back to this issue and try to fix during the 13.10 cycle.