only become discoverable once you send a message
- this allows people to just read/consume without broadcasting
- also improve the short ID by using last 6 characters (more unique)
Merge branch 'master' of https://github.com/akwizgran/gilgamesh into akwizgran-master

Conflicts:
	app/src/info/guardianproject/gilga/GilgaMesh.java
Added support for WifiDirect aka WifiP2pManager API
We can use WifiDirect in the same way we use Bluetooth, by changing
the device name, though the length is possibly more limited TBD
WifiDirects range is quite a bit better, so this is a big++ for devices
that can support it.
if bluetooth is off, turn it on w/o requiring discovery