- Adding first round of unit tests around MultiTabView;
- Updated MultiTabView interface:
   + added factory method + initializer taking a frame and tab names;
   + exposing array of tabs, primarily for testability;
- Updated TabView interface: exposing “name” property;
- Minor fix to TabView implementation: renamed method “isSelected” to “selected”.
- Remove temporary implementation of MultiTabView.drawRect;
- Updated TabView: added class method “selectedTabColor” - thus a single place defines the background color of a selected tab.