remove unnessesary css.
change default text.
Don't show events in the past.
Fix upgradestep.
Update eventlisting and newslisting. use baseclass to prevent duplicate code.
update tests.
change html markup
pep8
add Colorboxwrapper.
Merge branch 'tt-event-listing' into tt-events

Conflicts:
	ftw/contentpage/tests/test_event_listing.py