events should be ordered by date - newest first

[astroidex]

• when you visit the event page the events should be ordered by date. Newest first
• http://osgeo.getinteractive.nl/events/

[stevenfeldman]

Also events aren't exporting after their 'end date'

[astroidex]

• events that are already over (passed ended date) should somehow be still displayed (maybe possibility to hide them)
• maybe default should be to show all events - it is a good promotion and it is usefull to be able to click on a passed event and get all the information