test
Split in main and test folders and completed typechecker
Finished dependency checker and refactoring of packages
Added stand-alone runner for checking errors in a file provided as an argument
changed class hierarchy for equality expressions
bugfix: missing expr under question walking in AbstractTreeWalker
Bigfix: logic error in type check for boolean expressions
new sample QL file for testing
Merge branch 'master' of https://github.com/software-engineering-amsterdam/sea-of-ql into bartolkaruza-fb
Merge branch 'master' of https://github.com/software-engineering-amsterdam/sea-of-ql into bartolkaruza-fb