Another revision on event decorators

This revision of event decorators removes much of the complexity. The
decorated functions are no longer wrapped with a class that tracks
last_run, etc. Bootstrap now gives hass to the event_decorators module
before initializing components so the decorators no longer require
activation.

homeassistant/bootstrap.py

@@ -24,6 +24,7 @@ import homeassistant.config as config_util
 import homeassistant.loader as loader
 import homeassistant.components as core_components
 import homeassistant.components.group as group
+from homeassistant.helpers import event_decorators
 from homeassistant.helpers.entity import Entity
 from homeassistant.const import (
     __version__, EVENT_COMPONENT_LOADED, CONF_LATITUDE, CONF_LONGITUDE,
@@ -199,14 +200,13 @@ def from_config_dict(config, hass=None, config_dir=None, enable_log=True,
 
     _LOGGER.info('Home Assistant core initialized')
 
+    # give event decorators access to HASS
+    event_decorators.HASS = hass
+
     # Setup the components
     for domain in loader.load_order_components(components):
         _setup_component(hass, domain, config)
 
-    # activate event decorators
-    from homeassistant.helpers import event_decorators
-    event_decorators.activate(hass)
-
     return hass