New Update library, example, upload and more

Proper error handling in the uploading python script
Much faster OTA example sketch with better results
New Update class that simplifies updating the firmware from any source
Updated Esp.updateSketch() to use the new class

cores/esp8266/Arduino.h

@@ -233,6 +233,7 @@ void loop(void);
 
 #include "HardwareSerial.h"
 #include "Esp.h"
+#include "Updater.h"
 #include "debug.h"
 
 #define min(a,b) ((a)<(b)?(a):(b))