expression finished
Merge branch 'master' of https://github.com/sebastianstoelen/OOP-Worms

Conflicts:
	bin/worms/model/Facade.class
	src/programs/Program.java
	src/worms/model/expressions/VariableAccesExpression.java
	src/worms/model/expressions/WormExpression.java
	src/worms/model/statements/Assignment.java