Renamed observer_list_ to follow coding conventions. It is now "observerList_".
Replaced levelScreen_ member variable with more generic currentScreen_ of type JComponent.
Also stubbed out update method for changing out screens.
When last character i=of level is entered, the tskTyperModel_ is told to end the level. (transition to results screen)
Added init of observerList_. Added an "endLevel" method which triggers a publish event which should propagate through the presenter to the view and cause the screen to change.
Init of observerList_ and added methods for propagating screen change event info to the TskTyperView.