Added CoreBluetooth framework and import

Hi,

I was following along with Episode 95 and was racking my brain why I couldn't see the different colors testing with my iBeacon on my iPhone and then I realized the BeaconFun project didn't have the CoreBluetooth framework linked and the framework wasn't imported into the ViewController implementation.

After I did that the project works great, but I figured I'd contribute this back so others don't run into the same problem.