branch test

branch test ruudvanderweijde
removal of jacc
added antlr 3.5
rewrite of grammar (after github for windows killed all my changes)
first creation of classes
moved expression to expr package
created binary and unary classes
More AST implementation
Setting of values, adding getters
First try to implement visitor
update of UnitTests!
new line
Rename of unittest
Changed Form and Question id
Ident => String
created type package
packages indelen
package update
package layout, removed unused files
first tests with Visitor, including print visitor.
Also some more package refactoring
First for lower case class names ifThen and ifElse
More of visitor, with printer | refactor of IfThen/Else
Seems like a working visitor
Refactored IfThen and IfElse into IfThenElse with two constructors
Todo now, semantics check
VisitorDemo
First semantic checks added (Form & Question)
abstract class
Semantic visitor added 
removal of unused classes
split visitor into two visitors
refactored formVisitor (no logics in the class visitor)