Many changes to cleanup config directory and lib installations.

Cleaned up default config directory determination.
Made bootstrap creators for HA always set config directory.
Made bootstrap creators set the local library in the Python Path.
Moved all exceptions to their own file to make imports easier.
Moved default configuration directory be in the users’ profile.
Moved pip installs to be done to a lib folder in the config directory.
Reduced requirements.txt to only the barebones reqs.

homeassistant/core.py

@@ -7,6 +7,7 @@ of entities and react to changes.
 """
 
 import os
+import sys
 import time
 import logging
 import threading
@@ -21,9 +22,12 @@ from homeassistant.const import (
     EVENT_CALL_SERVICE, ATTR_NOW, ATTR_DOMAIN, ATTR_SERVICE, MATCH_ALL,
     EVENT_SERVICE_EXECUTED, ATTR_SERVICE_CALL_ID, EVENT_SERVICE_REGISTERED,
     TEMP_CELCIUS, TEMP_FAHRENHEIT, ATTR_FRIENDLY_NAME)
+from homeassistant.exceptions import (
+    HomeAssistantError, InvalidEntityFormatError, NoEntitySpecifiedError)
 import homeassistant.util as util
 import homeassistant.util.dt as date_util
 import homeassistant.helpers.temperature as temp_helper
+from homeassistant.config import get_default_config_dir
 
 DOMAIN = "homeassistant"
 
@@ -660,7 +664,11 @@ class Config(object):
         self.api = None
 
         # Directory that holds the configuration
-        self.config_dir = os.path.join(os.getcwd(), 'config')
+        self.config_dir = get_default_config_dir()
+
+    def mount_local_path(self):
+        """ Add local library to Python Path """
+        sys.path.insert(0, self.path('lib'))
 
     def path(self, *path):
         """ Returns path to the file within the config dir. """
@@ -695,21 +703,6 @@ class Config(object):
         }
 
 
-class HomeAssistantError(Exception):
-    """ General Home Assistant exception occured. """
-    pass
-
-
-class InvalidEntityFormatError(HomeAssistantError):
-    """ When an invalid formatted entity is encountered. """
-    pass
-
-
-class NoEntitySpecifiedError(HomeAssistantError):
-    """ When no entity is specified. """
-    pass
-
-
 def create_timer(hass, interval=TIMER_INTERVAL):
     """ Creates a timer. Timer will start on HOMEASSISTANT_START. """
     # We want to be able to fire every time a minute starts (seconds=0).