Remove problematic whitespace from answer type, correct answer, and user input.
Merge remote-tracking branch 'upstream/master' into f.whiteout
removed 'optional' questions from all modules and deleted the 'status' column since this was an experimental feature causing many bugs
Merge remote-tracking branch 'upstream/master' into issue.18
Merge branch 'issue.18' of github.com:WilCrofter/swirl into issue.18