Lots of changes:

* better data sharing in the app: put the BZController in a static class that is accessed via both controllers
* convert the second controller to be a table; show the identifiers and current status in the table rows
* many other behind-the-scenes changes

Where I got to tonight:

* when the table view comes into existence (since it only gets created when someone views the screen — not at the beginning of time), it needs to query the bzcontroller and get its data.  Otherwise, it’s blank until the bzcontroller decides to update again.
* didn’t look into why the beacon scanning isn’t working properly.