* Update scan_interval and interval_seconds max to 1 day vs. 60 seconds
* Format fixes
* Add docstring on unittest.
* Added and implemented new async_track_time_interval helper.
* Format fixes, removed unused import.
* Undid whoops on unsub_polling.
* Updated unit tests for scan_interval.
* Added unit test for track_time_interval.
* Allow other forms of time interval input for scan_interval and interval_seconds