Fix missing include for wklog
Add external IP widget
Automatically detect length of widget array
Add dbus checks to autoconf
Add notification daemon support

Based on ntylo/simplenotifydaemon, but simplified since queueing is
handled by the theme.

Ref #17
Closes #2 (but needs to be implemented in theme)
Fix error in external IP widget
widgets/volume: if channel is muted set volume to 0
readme: Update optional dependencies
util: add dbus-glib helper functions
widgets: add battery status widget

There's room for improvement, particularily regarding detection of the battery
on line 72.
widgets/battery: fix widget name