Resolve "Add creation/update ops for rooms, buildings, etc"

Adds termtime.update_(rooms, buildings, campuses, depts, floors) operations that POST and PUT to API to create and update each of these.

*Lots of similar code, but each slightly different as what is needed by each endpoint (what goes in URL path and what in query string) changes.

Tests succeed - limited testing against real CambTest API done

Closes #13 (closed)