Widgets: Shortcodes: Add 'Upcoming Events'
Load in the icalendar library that can be included from the widget or the shortcode.  Then add the shortcode and the widget.
Props: @ethitter @jacklenox @yoavf @cfinke @mattwiebe @briancolinger
Merge pull request #74 from georgestephanis/upcoming-events

Widgets: Shortcodes: Add 'Upcoming Events'