Ref #42. Moved a lot of the core functionality needed for all upcoming Rolodex adapters to a BaseRolodexAdapter class. This includes collapse/expand All methods, selectable methods, stableIds, and the getView methods. Looks like modal setChoice is working. Implemented a solution within the BaseRolodexAdapter which takes over alot of the callbacks and interaction with ListView methods. Needs more testing yet. Updated demo classes to use the new behavior.