Simplify gateway code (handles interrupts internally) and remove external dependencies. Ledmode is now always "enabled".

Remove unused libraries.
Add default CS/CE pin to Config.h
Add new variebles for voltage and current.
Add new internal command sent to controller when gateway is ready and online

libraries/MsTimer2/examples/FlashLed/FlashLed.pde

@@ -1,42 +0,0 @@
-char dummyvar; // to get Arduinoi IDE to include core headers properly
-
-/*
-  MsTimer2 is a small and very easy to use library to interface Timer2 with
-  humans. It's called MsTimer2 because it "hardcodes" a resolution of 1
-  millisecond on timer2
-  For Details see: http://www.arduino.cc/playground/Main/MsTimer2
-*/
-#include <MsTimer2.h>
-
-// Switch on LED on and off each half second
-
-#if defined(ARDUINO) && ARDUINO >= 100
-const int led_pin = LED_BUILTIN;	// 1.0 built in LED pin var
-#else
-#if defined(CORE_LED0_PIN)
-const int led_pin = CORE_LED0_PIN;	// 3rd party LED pin define
-#else
-const int led_pin = 13;			// default to pin 13
-#endif
-#endif
-
-
-void flash()
-{
-  static boolean output = HIGH;
-  
-  digitalWrite(led_pin, output);
-  output = !output;
-}
-
-void setup()
-{
-  pinMode(led_pin, OUTPUT);
-
-  MsTimer2::set(500, flash); // 500ms period
-  MsTimer2::start();
-}
-
-void loop()
-{
-}