Merge pull request #132 from jbliesener/master

Corrected typecast in usb_flightsim.cpp

teensy3/usb_flightsim.cpp

 		if (!hasCallbackInfo) {
 			(*change_callback)(val);
 		} else {
-			(*(void(*)(long,void*))change_callback)(val,callbackInfo);
+			(*(void(*)(float,void*))change_callback)(val,callbackInfo);
 		}
 	}
 }