add functionality to display by faculty interest

[btbonval]

Presently the faculty are organized by academic unit (sort of like department), both in the JSON and in the pack bubbles.

The pack bubbles should optionally be sorted by faculty interest. In this case, the JSON needs to be reworked to support both faculty interest and academic unit.

Additionally, there needs to be a switch/toggle to swap between the two modes.

In the case that one faculty has multiple interests, trying to intersect the interests would be ugly and hard to read. Instead, the faculty will appear as many times as interests that are had.

[btbonval]

Seth had to make changes to the thing that generates data.

[sethwoodworth]

Yeah, I still need to mess with this data. I am going to take the json we have now as gospel, and use it to lookup 'Person ID's and interests of individual faculty.