Test of readme
Update ruudvanderweijde/README.md
modified readme inforamtion
created checkBinaryNode function
comment update
read me update
Merge branch 'ruudvanderweijde-master' of https://github.com/software-engineering-amsterdam/sea-of-ql into ruudvanderweijde-master

Conflicts:
	ruudvanderweijde/README.md
Added toString to Binary Expressions
added to string functions
debug message removed
refactored come common functions, created private functions
update of error messages
Merge branch 'ruudvanderweijde-master'