* Add event loop to the core
* Add block_till_done to HA core object
* Fix some tests
* Linting core
* Fix statemachine tests
* Core test fixes
* fix block_till_done to wait for loop and queue to empty
* fix test_core for passing, and correct start/stop/block_till_done
* Fix remote tests
* Fix tests: block_till_done
* Fix linting
* Fix more tests
* Fix final linting
* Fix remote test
* remove unnecessary import
* reduce sleep to avoid slowing down the tests excessively
* fix remaining tests to wait for non-threadsafe operations
* Add async_ doc strings for event loop / coroutine info
* Fix command line test to block for the right timeout
* Fix py3.4.2 loop var access
* Fix SERVICE_CALL_LIMIT being in effect for other tests
* Fix lint errors
* Fix lint error with proper placement
* Fix slave start to not start a timer
* Add asyncio compatible listeners.
* Increase min Python version to 3.4.2
* Move async backports to util
* Add backported async tests
* Fix linting
* Simplify Python version check
* Fix lint
* Remove unneeded try/except and queue listener appproriately.
* Fix tuple vs. list unorderable error on version compare.
* Fix version tests
* Allow reloading groups without restart
* Test to make sure automation listeners are removed.
* Remove unused imports for group tests
* Simplify group config validation
* Add prepare_reload function to entity component
* Migrate group to use entity_component.prepare_reload
* Migrate automation to use entity_component.prepare_reload
* Clean up group.get_entity_ids
* Use cv.boolean for group config validation
* Accept group without entities in configuration.
People seem to use these as placeholders for future expansion of their
home automation dreams, and we used to accept them. We still have to
specify at least one of 'name', 'view' or 'icon' so that the group is
parsed as a dictionary.
* Also accept empty entities: key in a group.
* Additional fix for empty entities value in a group config.
