Added BlinkM support over i2c

Marlin/BlinkM.cpp

+/*
+  BlinkM.cpp - Library for controlling a BlinkM over i2c
+  Created by Tim Koster, August 21 2013.
+*/
+#if (ARDUINO >= 100)
+  # include "Arduino.h"
+#else
+  # include "WProgram.h"
+#endif
+#include "BlinkM.h"
+
+void SendColors(byte red, byte grn, byte blu)
+{
+  Wire.begin(); 
+  Wire.beginTransmission(0x09);
+  Wire.write('o');                    //to disable ongoing script, only needs to be used once
+  Wire.write('n');
+  Wire.write(red);
+  Wire.write(grn);
+  Wire.write(blu);
+  Wire.endTransmission();
+}
+

Marlin/BlinkM.h

+/*
+  BlinkM.h
+  Library header file for BlinkM library
+ */
+#if (ARDUINO >= 100)
+  # include "Arduino.h"
+#else
+  # include "WProgram.h"
+#endif
+
+#include "Wire.h"
+
+void SendColors(byte red, byte grn, byte blu);
+

Marlin/Configuration.h

 # endif
 #endif
 
+// define BlinkM Support
+#define BlinkM
+
 // Increase the FAN pwm frequency. Removes the PWM noise but increases heating in the FET/Arduino
 //#define FAST_PWM_FAN
 

Marlin/Marlin_main.cpp

 #include "language.h"
 #include "pins_arduino.h"
 
+#include "BlinkM.h"
+#include "Wire.h" 
+
 #if NUM_SERVOS > 0
 #include "Servo.h"
 #endif
 // M128 - EtoP Open (BariCUDA EtoP = electricity to air pressure transducer by jmil)
 // M129 - EtoP Closed (BariCUDA EtoP = electricity to air pressure transducer by jmil)
 // M140 - Set bed target temp
+// M150 - Set BlinkM Colour Output R: Red<0-255> U(!): Green<0-255> B: Blue<0-255> over i2c, G for green does not work.
 // M190 - Sxxx Wait for bed current temp to reach target temp. Waits only when heating
 //        Rxxx Wait for bed current temp to reach target temp. Waits when heating and cooling
 // M200 - Set filament diameter
       #endif
       break;
       //TODO: update for all axis, use for loop
+    case 150: // M150
+      {
+        byte red;
+        byte grn;
+        byte blu;
+        
+        if(code_seen('R')) red = code_value();
+        if(code_seen('U')) grn = code_value();
+        if(code_seen('B')) blu = code_value();
+        
+        SendColors(red,grn,blu);        
+      }
+      break;
     case 201: // M201
       for(int8_t i=0; i < NUM_AXIS; i++)
       {