instructor grading interface.

the location is passed around properly. Clarify some of the numbers for
the user

and display some new information on the problem-specific page

- now getting requests from js to server and back, with mocked service.

Renamed jsloader to match up with the content more explicitly; refactored Collapsible out into its own library

Remove commented out block and pull some stuff into a function to load the first page of results for a thread query.

created_at time as a tiebreaker. This is a stopgap though; the service should handle
this. But it looks silly with things shuffling around right now.

Fix pagination and sorting for followed threads. Also fixed sorting so that it always retrieves a new set of threads from the server for the initial set.