Clarified several things.
Emphasized "green" checkmarks.
Clarified what the output means.
Yet more clarifications.
Clarified "TODO" comments.
Clarified the diagnosticsEnabled variable behavior and added more pattern-oriented comments.
Added new grading driver.
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' of github.com:adam-may/POSA-14