Begin integrating the ScrollView into SwipeAltView
Implement experimental ScrollView2

Much less spammy of the DAO.
Further integration attempts
New approach to gestures

Based on asking views if the touch point is inside their position,
dynamically, rather than statically.
Nearly working ScrollView2. Dupes and unsub errors.
Update ScrollView demo to use DetailViews

This was a step toward reproducing some problems with using ScrollView2
in the MDUI controller.
More ScrollView2 integration progress.
Rebuild ScrollView2 to be based on an array cache.
Replace original ScrollView with new reimplementation
ScrollView: Handle re-init gracefully.
ProxyDAO's model now uses defaultValueFn, not postSet propagation
ScrollView: Dynamically compute rowHeight on init.

The parent view is no longer required to specify rowHeight.
Integrate new ScrollView into apps/gmail.

- ScrollView now supports preferredHeight property on the rowView, since
  some views aren't the right size (or won't load) with empty data.
- Specify the preferredHeight in Gmail, since the rows were too small
  without it.
- Integrate the new GestureManager into Gmail.