Update status code reason phrases

As per RFC2616

Author: Diaoul

libraries/ESP8266WebServer/src/ESP8266WebServer.cpp

@@ -372,11 +372,46 @@ void ESP8266WebServer::_handleRequest() {
 
 const char* ESP8266WebServer::_responseCodeToString(int code) {
   switch (code) {
+    case 100: return "Continue";
     case 101: return "Switching Protocols";
     case 200: return "OK";
+    case 201: return "Created";
+    case 202: return "Accepted";
+    case 203: return "Non-Authoritative Information";
+    case 204: return "No Content";
+    case 205: return "Reset Content";
+    case 206: return "Partial Content";
+    case 300: return "Multiple Choices";
+    case 301: return "Moved Permanently";
+    case 302: return "Found";
+    case 303: return "See Other";
+    case 304: return "Not Modified";
+    case 305: return "Use Proxy";
+    case 307: return "Temporary Redirect";
+    case 400: return "Bad Request";
+    case 401: return "Unauthorized";
+    case 402: return "Payment Required";
     case 403: return "Forbidden";
-    case 404: return "Not found";
-    case 500: return "Fail";
+    case 404: return "Not Found";
+    case 405: return "Method Not Allowed";
+    case 406: return "Not Acceptable";
+    case 407: return "Proxy Authentication Required";
+    case 408: return "Request Time-out";
+    case 409: return "Conflict";
+    case 410: return "Gone";
+    case 411: return "Length Required";
+    case 412: return "Precondition Failed";
+    case 413: return "Request Entity Too Large";
+    case 414: return "Request-URI Too Large";
+    case 415: return "Unsupported Media Type";
+    case 416: return "Requested range not satisfiable";
+    case 417: return "Expectation Failed";
+    case 500: return "Internal Server Error";
+    case 501: return "Not Implemented";
+    case 502: return "Bad Gateway";
+    case 503: return "Service Unavailable";
+    case 504: return "Gateway Time-out";
+    case 505: return "HTTP Version not supported";
     default:  return "";
   }
 }