refactor term_topics view

Pending Issues:

- [x] edit sections is broken
- [x] edit topics is broken
- [x] unable to add new section
- [x] CT status filter doesn't work
- [x] search filter
- [x] #95 - moving out of term_topic page reloads the page; doesn't hit backbone router
- [x] clicking on edit topic or edit section resets the current section selection
- [x] some style tweaks for edit_topic
- [x] #97 - delete section/topic shouldn't be a one-click event
- [x] Revisiting topic tab for the second time displays and empty div