https://bugzilla.gnome.org/show_bug.cgi?id=747715
This fixes some alignment issues with the calendar events pane. It also makes some legitibility improvements by using bigger fonts and clearer colors.
The style used to highlight today's date should follow the style of active panel buttons, so update it to reflect the new panel style. https://bugzilla.gnome.org/show_bug.cgi?id=642697