- more experimentations with temperature/pressure sensing
 * testing alternative methods of sensing setup (see code readTemperatureTest)
 * added q/deferred dependency and use to read data (not fully done, but where it is done, things are MUCH cleaner)
 * changed demo to non blocking as well (sleep.sleep was causing issues (it does block everything...)  with async elements like deferreds)
 * various experiments here and there : code is dirty but temperature sensing works better than before