Feature/http client (#1973)

* Pass client parameter into two new begin() functions. Set other begin() functions deprecated. Updated library version to 1.2

* Added working HTTPS example on a public url with a certificate

* Remove two unnecessary tests in ::disconnect()

* Add a scoping block to BasicHttpsClient.ino to assure HTTPClient is destroyed before WiFiClientSecure

* Added check to handle mixup of old and present api properly

* Correct HTTPClient::setTimeout() to convert milliseconds to seconds. Correct WiFiClient::setTimeout() to call Stream::setTimeout() with seconds converted back to milliseconds. Remove inproper checks for _insecure.

* Added small comment because it looked like the Travis build did not finish

libraries/WiFi/src/WiFiClient.cpp

@@ -240,6 +240,7 @@ int WiFiClient::setSocketOption(int option, char* value, size_t len)
 
 int WiFiClient::setTimeout(uint32_t seconds)
 {
+    Client::setTimeout(seconds * 1000);
     struct timeval tv;
     tv.tv_sec = seconds;
     tv.tv_usec = 0;