Emptied method implementations due to the major changes being made elsewhere.
Moved the getAllCellsAdjacent method from the Cell class to the Level class.  Also removed a bunch of Javadocs (temporarily) because they were distracting me.
Implemented the PropertyChangedListener. (More...)
Removed some Javadocs temporarily.
Removed methods that aren't needed anymore.
Made changes reflecting changes to LevelView constructor.
Removed unnecessary methods and dependencies.
Implemented PropertyChangeListener and temporarily removed a bunch of Javadoc.
Renamed some classes for code clarity.
Tests modified due to method name and class changes.