Debugging: added questionsLeft only for debugging.
Debugging: added req.session as return from findQuestion() method
Debugging: nextQuestion -> call http post only 4 times
Refactoring: cleanup of BarchartService
Refactoring: moved logic for Directive barChart into BarchartService.
Tests included.
Merge branch 'master' of https://github.com/ilovemygameboy/wissomat