* Permit thingspeak urn edit
* Update thinkspeak.ino
* Update index.html
* Replace Host, Port, and URL with Address in Thingspeak
* Create AsyncThingspeak object
Create AsyncThingspeak object to contain the url of the component.
* replace pointer by class member
Thingspeak class improvement to answer Max's question:
why use a pointer when it can be a class member?
So now address parameter isn't a pointer anymore.
* Update Thingspeak address on post