* Add observed entities to bayesian sensor
* Update binary_sensor.py to comply with style guidelines and test_binary_sensor.py to verify the entity_id
* Update binary_sensor.py and test_binary_sensor.py to include an additional attribute for observed entities
* Use of ATTR_ENTITY_ID and numeric key of observed entity
* Update binary_sensor.py
* Update test_binary_sensor.py to verify behavior
* Update to return a list without duplicates in the state attribute
* Update binary_sensor.py: rename of ATTR_ENTITY_ID into ATTR_OBSERVED_ENTITIES
* Rename new attribute into ATTR_OCCURRED_OBSERVATION_ENTITIES and fix test
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