Update upnp listener module to even be less strict in normal mode as I

have found instances of devices that do not follow the pure upnp
standard. Updated README as it was wrong for the upnp.device.db...it had
an s after device. updated the code to return back to config after
adding or updating a device.

README.md

@@ -18,7 +18,7 @@ The argument for the vera address should be given as it the system does not have
 The server defaults to the first available address on the host. Replace the -Dupnp.config.address=`<ip address>` value with the server ipv4 address you would like to use. 
 ### -Dserver.port=`<port>`
 The server defaults to running on port 8080. If you're already running a server (like openHAB) on 8080, -Dserver.port=`<port>` on the command line.
-### -Dupnp.devices.db=`<filepath>`
+### -Dupnp.device.db=`<filepath>`
 The default location for the db to contain the devices as they are added is "data/devices.db". If you would like a different filename or directory, specify -Dupnp.devices.db=`<directory>/<filename> or <filename>` if it is the same directory.
 ### -Dupnp.resonse.port=`<port>`
 The upnp response port that will be used. The default is 50000.  
@@ -90,4 +90,9 @@ After this Tell Alexa: "Alexa, discover my devices"
 
 Then you can say "Alexa, Turn on the office light" or whatever name you have given your configured devices.  
 
-To view or remove devices that Alexa knows about, you can use the mobile app Menu / Settings / Connected Home  
+To view or remove devices that Alexa knows about, you can use the mobile app Menu / Settings / Connected Home  
+## Debugging
+To turn on debugging for the bridge, use the following extra parm in the command line:
+```
+-Dorg.slf4j.simpleLogger.defaultLogLevel=DEBUG
+```