Put WiFi into station mode in examples

I was surprised that many of the examples implicitly create an
unsecured access point with complete access to my application, which
was based off the WiFiWebServer example. I'm sure I'm not the only one
surprised by this behaviour.

Putting the WiFi into station mode prevents the open access point from being
created.

Author: jes

libraries/ESP8266AVRISP/examples/Arduino_Wifi_AVRISP/Arduino_Wifi_AVRISP.ino

@@ -17,7 +17,7 @@ void setup() {
     Serial.println("Arduino AVR-ISP over TCP");
     avrprog.setReset(false); // let the AVR run
 
-    WiFi.mode(WIFI_STA)
+    WiFi.mode(WIFI_STA);
     WiFi.begin(ssid, pass);
     while (WiFi.waitForConnectResult() != WL_CONNECTED);