fix a JS error - never save null to remote lists :/
minor styling changes to card app.
make api endpoints for quiz more RESTful
minor styling and useful changes.
move router to app
fix tablesorter bug for empty tables (no quizzes), fixes #62
detect network connection lost and show error msg for that when saving.
Merge pull request #76 from domino14/bug/75/js_cards

Bug/75/js cards. close #75.