* Update configuration variable for dovado
Update configuration variable format.
Remove two optional configurations from the example configuration.
Section underneath configuration variable has a list of allowed values for the *sensors* array there. I am not sure how to describe this using the configuration block format. Possibly related to home-assistant/developers.home-assistant/issues/107
* Change format of accepted keys
Change format of accepted keys to pattern seen in other components.
Move additional information about the component (registering an SMS notifier) up to the top of the document.
* Minor changes
