Setting shouldAdvertise and shouldDiscover in init

[iasandcb]

The current code is

    switch (startOption) {
        case DIStartAdvertisingAndDetecting:
            _shouldAdvertise = YES;
            _shouldDiscover = YES;
            break;
        case DIStartAdvertisingOnly:
            _shouldAdvertise = YES;
            break;
        case DIStartDetectingOnly:
            _shouldDiscover = YES;
            break;
        case DIStartNone:
        default:
            break;
    }

but, setting properties instead of setting ivars is necessary because otherwise Discovery won't start ad and scan.

    switch (startOption) {
        case DIStartAdvertisingAndDetecting:
            self.shouldAdvertise = YES;
            self.shouldDiscover = YES;
            break;
        case DIStartAdvertisingOnly:
            self.shouldAdvertise = YES;
            break;
        case DIStartDetectingOnly:
            self.shouldDiscover = YES;
            break;
        case DIStartNone:
        default:
            break;
    }

[iasandcb]

The current workaround is

    discovery = Discovery(UUID: uuid, username: UIDevice.currentDevice().name, startOption:DIStartOptions.None, usersBlock: { (users: [AnyObject]!, usersChanged: Bool) -> Void in
        println("CH", usersChanged)
        println("OK", users.count)
    })
    discovery.shouldAdvertise = true
    discovery.shouldDiscover = true