Added AP_Declination test sketch. I will be improving the test sketch soon.

Signed-off-by: Andrew Tridgell <tridge@samba.org>

libraries/AP_Declination/examples/AP_Declination_test/AP_Declination_test.pde

@@ -0,0 +1,21 @@
+/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-
+
+// AVR runtime
+#include <avr/io.h>
+#include <avr/eeprom.h>
+#include <avr/pgmspace.h>
+#include <math.h>
+#include <FastSerial.h>
+#include <AP_Declination.h>
+
+FastSerialPort(Serial, 0);
+
+void setup(void)
+{
+	float declination = AP_Declination::get_declination(43.064191, -87.997498);
+	Serial.printf("declination: %d", declination);
+}
+
+void loop(void)
+{
+}

libraries/AP_Declination/examples/AP_Declination_test/Makefile

@@ -0,0 +1 @@
+include ../../../AP_Common/Arduino.mk