#3 Fails to build on OS X 10.8 due to removed APIs

[Andy Piper]

Apple removed IOBluetoothLocalDeviceReadAddress in 10.8

https://developer.apple.com/library/mac/#releasenotes/General/APIDiffsMacOSX10_8/IOBluetooth.html

LightBlue compiles against the 10.7 SDK but with deprecation warnings.