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/bootstrap.py

@@ -61,13 +61,13 @@ def setup_component(hass, domain, config=None):
     return True
 
 
-def _handle_requirements(component, name):
+def _handle_requirements(hass, component, name):
     """ Installs requirements for component. """
     if not hasattr(component, 'REQUIREMENTS'):
         return True
 
     for req in component.REQUIREMENTS:
-        if not pkg_util.install_package(req):
+        if not pkg_util.install_package(req, target=hass.config.path('lib')):
             _LOGGER.error('Not initializing %s because could not install '
                           'dependency %s', name, req)
             return False
@@ -88,7 +88,7 @@ def _setup_component(hass, domain, config):
             domain, ", ".join(missing_deps))
         return False
 
-    if not _handle_requirements(component, domain):
+    if not _handle_requirements(hass, component, domain):
         return False
 
     try:
@@ -138,14 +138,14 @@ def prepare_setup_platform(hass, config, domain, platform_name):
                     component)
                 return None
 
-    if not _handle_requirements(platform, platform_path):
+    if not _handle_requirements(hass, platform, platform_path):
         return None
 
     return platform
 
 
 # pylint: disable=too-many-branches, too-many-statements
-def from_config_dict(config, hass=None):
+def from_config_dict(config, hass=None, config_dir=None):
     """
     Tries to configure Home Assistant from a config dict.
 
@@ -153,6 +153,9 @@ def from_config_dict(config, hass=None):
     """
     if hass is None:
         hass = core.HomeAssistant()
+        if config_dir is not None:
+            hass.config.config_dir = os.path.abspath(config_dir)
+            hass.config.mount_local_path()
 
     process_ha_core_config(hass, config.get(core.DOMAIN, {}))
 
@@ -196,6 +199,7 @@ def from_config_file(config_path, hass=None):
 
     # Set config dir to directory holding config file
     hass.config.config_dir = os.path.abspath(os.path.dirname(config_path))
+    hass.config.mount_local_path()
 
     config_dict = config_util.load_config_file(config_path)