fixing nil answer bug
Merge pull request #1277 from teamleada/tristan_fix_interview_view

fixing nil answer bug
fix typo
checking that accepts comma
Merge pull request #1279 from teamleada/tristan_quiz_solution_matching

checking that accepts comma
gsubbing for both space and comma
Merge pull request #1278 from teamleada/tristan_add_healthcare_grader

Tristan add healthcare grader
disable healthcare mini challenge
Merge branch 'master' into beta