Melzi support

Marlin/Configuration.h

 // Gen6 = 5
 // Gen6 deluxe = 51
 // Sanguinololu 1.2 and above = 62
+// Melzi = 63
 // Ultimaker = 7
 // Teensylu = 8
 // Gen3+ =9

Marlin/pins.h

 * Sanguinololu pin assignment
 *
 ****************************************************************************************/
-#if MOTHERBOARD == 62
+#if MOTHERBOARD == 63
+#define MELZI
+#endif
+#if MOTHERBOARD == 62 || MOTHERBOARD == 63
 #undef MOTHERBOARD
 #define MOTHERBOARD 6
 #define SANGUINOLOLU_V_1_2 
 
 #define FAN_PIN            -1 
 
+#ifdef MELZI
+#define LED_PIN            28
+#define FAN_PIN            4
+#endif
+
 #define PS_ON_PIN          -1
 #define KILL_PIN           -1
 
 #define SDPOWER            -1
 #define SDSS               31
 
+#ifdef MELZI
+#define SDSS               24
+#endif
+
 #endif