Modification will be needed on all statements to acquire the last performed statement.

* Created WhileStatement & IfStatement.

* Modified PrintStatement
	It had to print using the IActionHandler instead of System.out.println()

* Modified/Added exceptions
	Created our own exception(line, column, message) and replaced the exceptions we threw.

* Modified ProgramFactoryImpl
	Added Statements If/While/Skip
	Added Expression Self
	Added a way to set the worm of the program as well as set the parser.

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