make HTTP Update Server more secure (#2104)

* make HTTP Update Server more secure

* added option for authentication
* added option to change the url for upload

* move to overloaded setup

* remove delay in both examples

* Get better result responses

* fix strings

interesting, the meta did not refresh if the successResponse is put in
"R"

libraries/ESP8266HTTPUpdateServer/examples/WebUpdater/WebUpdater.ino

@@ -39,5 +39,4 @@ void setup(void){
 
 void loop(void){
   httpServer.handleClient();
-  delay(1);
 }