Add shadow offset support for NIGroupedCellBackground.
Merge pull request #383 from jverkoey/offset

Add shadow offset support for NIGroupedCellBackground.
[css] Add UIKit import to NIUserInterfaceString.h.
Add methods to get information from an NITableViewActions object about which cell accessory it would provide for a particular object
Merge pull request #388 from darrenw/TableActionsInfo

Add some object-state methods on NITableViewActions