Fixed bug saving preferences, fixed bug waking drivers, some additional assertions added
Coordinator.java:
-fixed bug where drivers could not wake themselves

MessageCenter.java:
-added assertions to sendMessage() and sendMessageFragment()

Prefs.java:
-fixed bug in savePreferences() where empty (null) username and password were being written to the database

Local.java:
-changed toggleLed() to check for a response message before updating the status of the widget

Motion.ino:
-added an LED to indicate when motion has been detected