Question service tests completed and passing #90
Merged
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I corrected the test cases and some minor bugs there were in question-service.js.
Regarding #84, I thought initially that tests were not passing due to the async tests behaving as concurrent users and my approach of answer storing not being adequate for it, but once I corrected those mistakes now they all pass.
I have to investigate more but it is possible that the global variable 'correctImage' in question-service.js is unique per session, so there should be no collision between different users in reallity and question-service should thus be complete (That is what I infered from the results of the async tests, which I ran multiple times).