#54: Implement /judging (post)
Fixed comment. Fixed http code always returning 201 (overriding 404)
#49: Implement /messages/:id/reply (post)
#48: Implement /messages/:id (put)
Fixed output examples returning response.success as string instead of boolean
For POST/PUT: return status object directly
#43: Implement /participants/:membername/:challenge_id/delete_submission_url_file (get)
#31: Implement /challenges/:challenge_id/submission_deliverables (get)
closes #54, closes #49, closes #48, closes #43, closes #31