New way of parsing expressions see http://stackoverflow.com/questions/5575452/parsing-expressions-with-subexpressions-in-antlr
First handling of different types
Still testing the boundaries of ANTLR
Refactored Statements to not add their parents on their own
Removed unused cases
Removed unused classes
Introduced Variable containers and refactoring
Parsing complete
Variables are now expressions
Variable names can now be searched for
Validation of declared variables works + tested
Type validator works
Merge branch 'master' of github.com:software-engineering-amsterdam/poly-ql