Bootstrap / Component setup async (#6264)

* Bootstrap / Entiy setup async

* Cleanup add_job stuff / return task/future object

* Address paulus comments / part 1

* fix install pip

* Cleanup bootstrap / move config stuff to config.py

* Make demo async

* Further bootstrap improvement

* Address Martin's comments

* Fix initial tests

* Fix final tests

* Fix bug with prepare loader

* Remove no longer needed things

* Log error when invalid config

* More cleanup

* Cleanups platform events & fix lint

* Use a non blocking add_entities callback for platform

* Fix Autoamtion is setup befor entity is ready

* Better automation fix

* Address paulus comments

* Typo

* fix lint

* rename functions

* fix tests

* fix test

* change exceptions

* fix spell

homeassistant/components/script.py

@@ -25,7 +25,6 @@ from homeassistant.helpers.script import Script
 DOMAIN = "script"
 ENTITY_ID_FORMAT = DOMAIN + '.{}'
 GROUP_NAME_ALL_SCRIPTS = 'all scripts'
-DEPENDENCIES = ["group"]
 
 CONF_SEQUENCE = "sequence"
 
@@ -130,6 +129,7 @@ def async_setup(hass, config):
                                  schema=SCRIPT_TURN_ONOFF_SCHEMA)
     hass.services.async_register(DOMAIN, SERVICE_TOGGLE, toggle_service,
                                  schema=SCRIPT_TURN_ONOFF_SCHEMA)
+
     return True