* Bump firetv to 1.0.8
* Update the 'update' function for Fire TV
* Return None for properties when unavailable
* Remove 'self.adb_lock' attribute
* Remove threading import
* Update configuration for Fire TV component
* Clarify 'python-adb' vs. 'pure-python-adb'
* Rename '__adb_decorator' to '_adb_exception_catcher'
* Don't check 'self._available' in properties
* Bump firetv to 1.0.9