* Moved subscribed and subscribed_motion attributes to doorbell devices only

* Allows option to make token persistent and register push_notify_urls

* Introduced check_alerts() method (#17)

* added initial control to alert notifications

* Removed JSON from tests

* Make lint happy

* Update README

* Only publish PUSH url if we have one

* Display error message only if in debug

* override default URL

* Make check alerts a callable function

* Removed extra space

* Move inside the try/except for safeness

* Introduced mecanism to save current alert state to a pickle file to allow concurrent objects to share alert notifications

* Moved self._alert_cache position

* version bump 0.1.1