Show bluetooth NAP Connections

When using Bluetooth to create an internet Connection with your phone, it does not show up in the indicator or the network plug. Network Manager is fully aware of the connection though and even classifies it as a Bluetooth device.
Setting the connection over Bluetooth up is done manually every time as far as I can tell, ad we also provide no GUI method for that as of yet. One way to try it out is using blueman which is a detailed interface to bluez, our Bluetooth stack.

Expected behaviour:
- Show an active NAP Connection in the Network Indicator
- Show an active NAP Connection in the Network Plug
- Provide a way to connect and disconnect the Bluetooth NAP connection

Launchpad Details: [#LP1591570](https://bugs.launchpad.net/bugs/1591570) Fabian Thoma - 2016-06-11 21:44:16 +0000

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