implemented toString methods
better error message
added check for invalid typ
move to question package
Added check to compare comupted type with question type
Moved and renamed unittests
Bug/Type fixes in And Neg Pos.
Added and expanded unittests.
Merge branch 'ruudvanderweijde-master'
Allow UndefinedType to be in an boolean expression
the value of an undefined type = false;
readme update + gitignore
Added EOF, so there will be no tags allowed after the last closing form
bracket '}' of 'form id { }'
Unittest updates, split form into Form, IfThenElse, Question
Only allow boolean expression in if conditions.
Only allow numeric types in computed questions.
Only allow one form tag, or else it will be overwritten.
Removed check for multiple form ids, since there is only one form
allowed now.
Renamed Visitor interface to IVistor and xxChecker to xxVisitor.
primary class added
primary class added
primary class added