Jira 768 CurieBLE: setAppearance does not work

In v1.0.7 `blePeripheral.setAppearance(appearance);` was function, however in master is does not - the appearance characteristic value is 0. Note: `blePeripheral.setDeviceName(name)` still works.

```arduino
#include

BLEPeripheral blePeripheral; // BLE Peripheral Device (the board you're programming)
BLEService ledService("19B10000-E8F2-537E-4F6C-D104768A1214"); // BLE LED Service

// BLE LED Switch Characteristic - custom 128-bit UUID, read and writable by central
BLEUnsignedCharCharacteristic switchCharacteristic("19B10001-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite);

const int ledPin = 13; // pin to use for the LED

void setup() {
Serial.begin(9600);

// set LED pin to output mode
pinMode(ledPin, OUTPUT);

// set advertised local name and service UUID:
blePeripheral.setLocalName("LED");
blePeripheral.setDeviceName("LED");
blePeripheral.setAppearance(0x1234);
blePeripheral.setAdvertisedServiceUuid(ledService.uuid());

// add service and characteristic:
blePeripheral.addAttribute(ledService);
blePeripheral.addAttribute(switchCharacteristic);

// set the initial value for the characeristic:
switchCharacteristic.setValue(0);

// begin advertising BLE service:
blePeripheral.begin();

Serial.println("BLE LED Peripheral");
}

void loop() {
// listen for BLE peripherals to connect:
BLECentral central = blePeripheral.central();

// if a central is connected to peripheral:
if (central) {
Serial.print("Connected to central: ");
// print the central's MAC address:
Serial.println(central.address());

// while the central is still connected to peripheral:
while (central.connected()) {
// if the remote device wrote to the characteristic,
// use the value to control the LED:
if (switchCharacteristic.written()) {
if (switchCharacteristic.value()) { // any value other than 0
Serial.println("LED on");
digitalWrite(ledPin, HIGH); // will turn the LED on
} else { // a 0 value
Serial.println(F("LED off"));
digitalWrite(ledPin, LOW); // will turn the LED off
}
}
}

// when the central disconnects, print it out:
Serial.print(F("Disconnected from central: "));
Serial.println(central.address());
}
}
```

Start by tracing the blePeripheral.setAppearance(0x1234) entry point and compare its behavior between v1.0.7 and master, then inspect how blePeripheral.begin() publishes the appearance value. Reproduce the provided CurieBLE example and verify that the appearance characteristic is no longer 0 while setDeviceName still works.

Written by the indexing model from the issue text.