cleaned up the widget buttonGroup CSS
This is in preparation of adding more thermostat functionality.  There's no more "leftmost", "middle", and "rightmost" classes for buttons, and the buttonGroup doesn't have to specify "one" "to" or whatever.  The new style uses table displays for happy funtime. Thanks to Luke Mason <http://lukemason.net> for helping me with this
The widget styles could still use more attention.