0.7.0rc5
  - created extension

0.7.0rc6
  - added startup and shutdown methods to script
  - fixes AppConfig for setup.py develop

0.7.0rc8
  - fixed worker
  - added extras/device-write-task_to_variable-property.py

0.7.0rc9
  - fixed default values for time_from, time_to, time_start
