modify EZAudioDevice internal implementation

[tomisacat]

I check out the part for OS X and found maybe you want to make the internal devices enumeration methods implemented like NSArray:

+ (void)enumerateDevicesUsingBlock:(void(^)(EZAudioDevice *device,
                                            BOOL *stop))block
{
    if (!block)
    {
        return;
    }

    // get the present system devices
    AudioObjectPropertyAddress address = [self addressForPropertySelector:kAudioHardwarePropertyDevices];
    UInt32 devicesDataSize;
    [EZAudioUtilities checkResult:AudioObjectGetPropertyDataSize(kAudioObjectSystemObject,
                                                                 &address,
                                                                 0,
                                                                 NULL,
                                                                 &devicesDataSize)
                        operation:"Failed to get data size"];

    // enumerate devices
    NSInteger count = devicesDataSize / sizeof(AudioDeviceID);
    AudioDeviceID *deviceIDs = (AudioDeviceID *)malloc(devicesDataSize);

    // fill in the devices
    [EZAudioUtilities checkResult:AudioObjectGetPropertyData(kAudioObjectSystemObject,
                                                             &address,
                                                             0,
                                                             NULL,
                                                             &devicesDataSize,
                                                             deviceIDs)
                        operation:"Failed to get device IDs for available devices on OSX"];

    BOOL stop = NO;
    for (UInt32 i = 0; i < count; i++)
    {
        AudioDeviceID deviceID = deviceIDs[i];
        EZAudioDevice *device = [[EZAudioDevice alloc] init];
        device.deviceID = deviceID;
        device.manufacturer = [self manufacturerForDeviceID:deviceID];
        device.name = [self namePropertyForDeviceID:deviceID];
        device.UID = [self UIDPropertyForDeviceID:deviceID];
        device.inputChannelCount = [self channelCountForScope:kAudioObjectPropertyScopeInput forDeviceID:deviceID];
        device.outputChannelCount = [self channelCountForScope:kAudioObjectPropertyScopeOutput forDeviceID:deviceID];
        block(device, &stop);
        if (stop)
        {
            break;
        }
    }

    free(deviceIDs);
}

but the part for iOS is not implemented like that.