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
Merge branch 'develop' of github.com:Lokaltog/wkline into plugins
Added settings capability

Added code to handle parsing of settings.
Began configuration file implementation

Began adding code to handle dynamic configuration a la JSON configuration
Implemented more config file stuff

Added support for widgets and other main configuration settings.