Fix for DIJN.10 and rf12demo-serial



While following along with DIJN it is easy to get stuck on DIJN.10. When npm is started/restarted or the briq is installed, it does not get the configuration information from the attached jeenode/jeelink and the Demo briq appears to show no input.

Restarting the attached jeenode/jeelink is one way to resolve the problem, but that isn't ideal, as users would have to reset it every time npm is restarted.

The ideal fix will automatically query the attached node to retrieve the configuration values when the rf12demo-serial briq is started.

See discussion here: http://jeelabs.net/boards/9/topics/1792?r=2344