Update raspi docs for v3 and 2016-02-26
Created by: cshields
Tested the docs against a Raspberry Pi 3 and against raspbian 2016-02-26. Updated docs to reflect that. Also added a recommended rpi-update before the apt-get update.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Created by: cshields
Tested the docs against a Raspberry Pi 3 and against raspbian 2016-02-26. Updated docs to reflect that. Also added a recommended rpi-update before the apt-get update.