Added chess figure tests and their corresponding comments. Did some minor
changes/bugfixes.
Merge branch backup into develop

Conflicts:
	src/chessFigures/AChessFigureDecorator.java
	src/chessFigures/ChessFigure.java
	src/chessFigures/IChessFigure.java
	src/chessFigures/PawnBeatingBehaviour.java
	src/chessFigures/PawnMovementBehaviour.java
	src/jchess/ChessFigureManager.java
	src/jchess/Game.java
	src/jchess/ImageLoader.java