Add ESP.reset() method

Author: igrr

README.md

@@ -116,6 +116,8 @@ APIs related to deep sleep and watchdog timer are available in the ```ESP``` obj
 
 ```ESP.wdtEnable()```, ```ESP.wdtDisable()```, and ```ESP.wdtFeed()``` provide some control over the watchdog timer.
 
+```ESP.reset()``` resets the CPU.
+
 #### OneWire (from https://www.pjrc.com/teensy/td_libs_OneWire.html) ####
 
 Library was adapted to work with ESP8266 by including register definitions into OneWire.h

hardware/esp8266com/esp8266/cores/esp8266/Esp.cpp

@@ -55,3 +55,8 @@ void EspClass::deepSleep(uint32_t time_us, WakeMode mode)
 	system_deep_sleep_set_option(static_cast<int>(mode));
  	system_deep_sleep(time_us);
 }
+
+void EspClass::reset()
+{
+	((void (*)(void))0x40000080)();
+}

hardware/esp8266com/esp8266/cores/esp8266/Esp.h

@@ -39,6 +39,8 @@ class EspClass {
         void wdtFeed();
 
         void deepSleep(uint32_t time_us, WakeMode mode = WAKE_RF_DEFAULT);
+
+        void reset();
 };
 
 extern EspClass ESP;