add toggle wifi command (#241)

* add toggle_wifi command

* update comment to indicate toggle_wifi is only for Android

Author: joshuasince1986

appium/webdriver/mobilecommand.py

@@ -28,6 +28,7 @@ class MobileCommand(object):
     DEACTIVATE_IME_ENGINE = 'deactivateIMEEngine'
     GET_ACTIVE_IME_ENGINE = 'getActiveEngine'
     TOGGLE_LOCATION_SERVICES = 'toggleLocationServices'
+    TOGGLE_WIFI = 'toggleWiFi'
     LOCATION_IN_VIEW = 'locationInView'
 
     # Appium Commands

appium/webdriver/webdriver.py

@@ -1116,6 +1116,12 @@ def update_settings(self, settings):
         self.execute(Command.UPDATE_SETTINGS, data)
         return self
 
+    def toggle_wifi(self):
+        """Toggle the wifi on the device, Android only.
+        """
+        self.execute(Command.TOGGLE_WIFI, {})
+        return self
+
     def toggle_location_services(self):
         """Toggle the location services on the device. Android only.
         """
@@ -1500,6 +1506,8 @@ def _addCommands(self):
             ('POST', '/session/$sessionId/appium/settings')
         self.command_executor._commands[Command.TOGGLE_LOCATION_SERVICES] = \
             ('POST', '/session/$sessionId/appium/device/toggle_location_services')
+        self.command_executor._commands[Command.TOGGLE_WIFI] = \
+            ('POST', '/session/$sessionId/appium/device/toggle_wifi')
         self.command_executor._commands[Command.SET_LOCATION] = \
             ('POST', '/session/$sessionId/location')
         self.command_executor._commands[Command.LOCATION_IN_VIEW] = \