Limited scrollview

Ground work for limited scrollview (name change pending), so far this is just a scroller refactored to manage its own data source (a simple array). This implementation is far less modular, but supplies a lot in the way of interface candy. At the time of this writing I still need to add:

getItemPosition
getAbsolutePosition
getCurrentItemIndex

pagination
integration with physics and sync

probably more stuff but I can't remember