Fix for runtime errors on OS X 10.8.4

While this lightblue may very well compile on 10.8, it doesn't really work there, at least it most certainly does not on my 10.8.4 with python 2.7.3 installed from Homebrew.
The problem is missing IOBluetoothDeviceInquiryDelegate protocol method implementations in _AsyncDeviceInquiry and incorrect type encoding string for the - (void) deviceInquiryComplete:(IOBluetoothDeviceInquiry*)sender error:(IOReturn)error aborted:(BOOL)aborted; method.
This fixes both issues.