* Remove build dirs from docker image to keep the layers small
* Create setup_docker_prereqs script to prepare docker env
* Add documentation for required packages, drop colorlog and cython in first step of Dockerfile since it will be installed later on anyway. Drop libglib2.0-dev and libbluetooth-dev
* Also remove early install of colorlog and cython in Dockerfile.dev
* Re-add libglib2.0-dev and libbluetooth-dev for Bluetooth LE
* Add Lannouncer notify component
* Send message by opening a raw TCP socket instead of using requests. Cleanup of method validation.
* Use 'return' instead of 'return None'
* Add a volume to store the tox cache on the host. This gives quite some speed boost when running lint_docker and test_docker.
* Only map .tox directory for cache.
* Allow bower install of frontend components as root. Needed for frontend development in docker since everything runs as root in the docker image.
* Improve development workflow in docker
* Use LANG=C.UTF-8 in tox. Fixes installation of libraries with UTF-8 in it's readme.
* Install mysqlclient psycopg2 uvloop after requirements_all.txt again, but with a --no-cache-dir this time. Allows bootstrap_frontend to be executed in a different path like the other scripts.
* Add support for Hue LightGroup entity
* Don't filter on LightGroup and add properties for a group
* Reuse code from HueLight in HueLightGroup
* Remove HueLightGroup and add is_group variable to HueLight
* Make linter happy
* Update light or lightgroup state when a new state is available
* Use schedule_update_ha_state() to schedule the state update. Drop new_lightgroups and use new_lights instead.
* code style fix
* Remove fixed throttle for binary_sensor.command_line and sensor.command_line since the scan_interval is configured trough YAML since #1059
* Clean up imports
* Add SCAN_INTERVAL=60 to put default scan_inteval back to 60
