Create /events/:day/:building/:room/sections route for rooms

[jpahm]

@TyHil has created a rooms-route branch as part of #247, which adds some new functionality to the API necessary for serving UTD Rooms.

This issue's focus is on adding another route to this branch which provides the section objects for a specific day, building, and room.

[TyHil]

The /events/:day/:building/:room route also has not been implemented so that would be a good starting place. Then the /events/:day/:building/:room/sections route can just replace all the section IDs from that result with the actual section objects.