fixed warnings on OS X (maybe others also)
Fix the annoying error when compiling on OS X.

pwnmetheus2/AppleMobileDevice.h:56:33: error:
extra qualification on member 'AddDevicesForPID'
	static void AppleMobileDevice::AddDevicesForPID(SInt32 usbPID);
Merge pull request #6 from Neal/fix-osx-errors

Fix OS X compile errors