* successfully tested the "remote temperature mode" switch for the radio thermostat
* removed logging and interpreted None as Off.
* turn_off value is also templated now -- can depend on state
Also, undid accidental removal of error logging.
* ensured backward compatibility of config file
if value_template is not provided, the update function behaves as before
* ran autopep8 --in-place
* fixed another complaint of tox
* addressed the comments of balloob
* undid acccidental log.error to log.info
* timeout : 50 -> 10
* added a timeout parameter
* removed the stray '-', better names for the failure case
* string comparisons after .lower(), as suggested by balloob
* addressed balloob's latest requests
* making flake happy
* value_template --> is_on_template in config file
* moved CONF_IS_ON_TEMPLATE to local file
* null checks
* addressed flake error
* properly comparing template text when is_on is not a template.
The switch can get the state via GET and set the state via POST
on a given REST resource.
It is not able to control arbitrary urls but it allows controlling
switches exposed via "real" REST.
