Add support for multiple devices

[ljyanesm]

Support for multiple devices is still required.

I think a show of hands on how to do this would be good, the options I can think of are:

1. Each device is independent and requires an individual DB on the same server (this is supported by the current status)
2. Each device requires a different DB server and it's treated as a completely independent project (this is supported by the current status)
3. Each device has an ID an it is added to each of the records on the DB

Options 1,2 would still require some way of automating adding a new device to a setup.
Option 3 needs both a way to control individual or groups of devices and a way to connect the devices back to the DB (defining the device ID on both ends, the DB and the device itself).