Merge pull request #32 from CSSE1001/tests_framework

Resolved #21 and refactored TutorialTestResult and TestResult
added dict1.tut
Merge branch 'master' of https://github.com/CSSE1001/MyPyTutor
Updated string5.tut
Added newlines between warnings/errors
Now uses TutorialNodeVisitor.identifier
Added list1.tut
Fixed typo :(