Implement GAPickerView selectionAlignment layout feature. The possible alignment options are align to left edge, right edge or center of the view.
Implement selected and non-selected opacity change for GAPickerTableView columns.
Experiments with inertia.
Add inertial scrolling anf rubber banding to GAPickerTableView via UIScrollView subview; wip.
Refactor _selectedColumn in GAPickerTableView. The internal selected column now depends on the scroll view content offset.
Improve GAPickerTableView selection sound.