New touch friendly ScrollArea and TableView API

ScrollArea can now be used together with a flicakble.

The patch also adds some new documentation ScrollArea,
TableView and TextArea

Change-Id: Ic2651966d42aadece3a6b919ea1f24e5905c665a
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>