Convert IPAddress to String for use with Spark.publish()

Firmware
4

I just added a change to firmware so you can turn any Printable into a String (IPAddress is Printable):

  IPAddress myIP = WiFi.localIP();
  Spark.publish("LocalIP", String(myIP), PRIVATE);

This will be in the 0.4.5 release, due out on 2 Sept.

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