Android: Added support for 'direction' to scrollTo.

This fix adds a new option (direction) to 'mobile: scrollTo'.
If 'horizontal' is provided (or if the view is a HorizontalScrollView),
we will call setAsHorizontalList() before commencing the scroll.
Merge pull request #1961 from paymand/scrollTo

Android: Added support for 'direction' to scrollTo.