Don't display plus signs when building is closed

[MichaelRBond]

We need to make it so that the json calendar lists the room as unavailable if the building is closed during.

it can just mark the room as reserved, with a user name of "building closed"

the javascript shouldn't display the username but add an additional class for potential styling.

should only check if a building is closed if the room's building has an hour's url defined.

may need to pass in an additional query string so we don't have to query every hour of the day. one query to get all 24 hours for the day. likely have it pass back a json instead of an RSS.

┆Issue is synchronized with this Asana task

[MichaelRBond]

Waiting on the update to the Hours app to complete this one.