Rascal skeleton setup
ANTLR skeleton setup
Merge branch 'master' of https://github.com/software-engineering-amsterdam/sea-of-ql into bartolkaruza-fb
setup base grammar and AST classes
Merge branch 'master' of https://github.com/software-engineering-amsterdam/sea-of-ql into bartolkaruza-fb
removed walkNode interface and implementations
Updated grammar for QL
Implemented visitor and composite patterns for the AST
Added unit tests for form parsing and print visitor
Merge branch 'master' of https://github.com/software-engineering-amsterdam/sea-of-ql into bartolkaruza-fb