fix initialization problems in examples

Author: Wenn0101

libraries/EEPROM/examples/Example1_PutGet/Example1_PutGet.ino

@@ -13,6 +13,7 @@
 void setup() {
   SERIAL.begin(115200);
   SERIAL.println("EEPROM Example1_PutGet");
+  EEPROM.init();
 
   // use EEPROM.get(int index, T type) to retrieve
   // an arbitrary type from flash memory

libraries/WDT/examples/Example1_WDT_Basic/Example1_WDT_Basic.ino

@@ -33,6 +33,8 @@ void setup() {
   Serial.begin(115200);
 
   Serial.println("Artemis Watchdog Timer Example");
+  
+  pinMode(LED_BUILTIN, OUTPUT);
 
   // Start the watchdog
   wdt.start();

libraries/WDT/examples/Example2_WDT_Config/Example2_WDT_Config.ino

@@ -43,6 +43,7 @@ void setup()
 
   Serial.println("Artemis Watchdog Timer Example");
 
+  pinMode(LED_BUILTIN, OUTPUT);
   // Configure the watchdog
   /*
     Available watchdog timer clock dividers.