Add tree of services and characteristics

[Mailisyorlik]

https://developer.apple.com/library/ios/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/PerformingCommonPeripheralRoleTasks/PerformingCommonPeripheralRoleTasks.html

Add characteristics for the LED and beeper functions on tagViewController... Seems to be the only actual BLE code we'll need. Might be hard to test without a tag.