Added core daemon function as flags.

Created three additional flags for the hass command:
-v -  Toggle verbose log file output
—pid-file -  Specify PID file path
—daemon -  Launch as daemon (nix only)

The core now binds to SIGQUIT on nix systems to trigger a clean
shutdown.

Modified HTTP server to write logging messages through the logging
module.

homeassistant/core.py

@@ -9,6 +9,7 @@ of entities and react to changes.
 import os
 import time
 import logging
+import signal
 import threading
 import enum
 import re
@@ -73,13 +74,16 @@ class HomeAssistant(object):
             will block until called. """
         request_shutdown = threading.Event()
 
-        def stop_homeassistant(service):
+        def stop_homeassistant(*args):
             """ Stops Home Assistant. """
             request_shutdown.set()
 
         self.services.register(
             DOMAIN, SERVICE_HOMEASSISTANT_STOP, stop_homeassistant)
 
+        if os.name != "nt":
+            signal.signal(signal.SIGQUIT, stop_homeassistant)
+
         while not request_shutdown.isSet():
             try:
                 time.sleep(1)