* Update query to include maxAge
Updated the query from recorded to include MaxAge if set; reducing the amount of records retrieved that would otherwise be purged anyway for the sensor.
* Initialization upon HASS start
Register the state listener and read previous information from recorder once HASS is started.
* Updated test_statistics.py for HASS start
Updated test_statistics.py to start HASS and wait it is completed before running test.
* Added newline in docstring
Added newline in docstring.
* Added start of HASS to test_initialize_from_database_with_maxage
Added start of HASS to new test test_initialize_from_database_with_maxage.
* Updates based on review
Following updates based on review:
-) Removed self._hass and passing hass
-) Changed async_add_job to async_create_task
-) For state update, calling async_schedule_update_ha_state
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