Port PyWemo from external to requirements.txt

.gitmodules

@@ -1,6 +1,3 @@
-[submodule "homeassistant/external/pywemo"]
-	path = homeassistant/external/pywemo
-	url = https://github.com/balloob/pywemo.git
 [submodule "homeassistant/external/noop"]
 	path = homeassistant/external/noop
 	url = https://github.com/balloob/noop.git

homeassistant/components/switch/wemo.py

@@ -12,17 +12,8 @@ from homeassistant.components.switch import SwitchDevice
 # pylint: disable=unused-argument
 def setup_platform(hass, config, add_devices_callback, discovery_info=None):
     """ Find and return WeMo switches. """
-    try:
+    import pywemo
-        # pylint: disable=no-name-in-module, import-error
+    import pywemo.discovery as discovery
-        import homeassistant.external.pywemo.pywemo as pywemo
-        import homeassistant.external.pywemo.pywemo.discovery as discovery
-    except ImportError:
-        logging.getLogger(__name__).exception((
-            "Failed to import pywemo. "
-            "Did you maybe not run `git submodule init` "
-            "and `git submodule update`?"))
-
-        return
 
     if discovery_info is not None:
         device = discovery.device_from_description(discovery_info)

requirements.txt

@@ -82,3 +82,6 @@ pynetgear>=0.1
 
 # Netdisco (discovery)
 netdisco>=0.1
+
+# Wemo (switch.wemo)
+pywemo>=0.1