remove traces of plone.formwidget.datetime
Provide 'event_view' view on occurences for better consistency
depends on icalendar 3.0 with timezones handling
add basque translation
Complete italian translation
fix typos and some bad translation
fix typo
add some more version pins

this way `versions.cfg` can be used in `extends` without (a plone 4.3) buildout complaining about picked versions...
Update contributors.rst
Add Traditional Chinese Translation.
there is no exact 3.0 release
use event_view in place of index_html for default view
Remove X-WR-CALNAME (fixes MS Outlook problem)
start annotation-to-attribute storage migration step
apidoc, comments
Changed  and  to accept IEvent, IOccurrence and IEventAccessor objects and avoid confusion on using these methods.
Merge pull request #129 from l34marr/zh-tw-translation

Add Traditional Chinese Translation.
tnx!
Merge remote-tracking branch 'FHNW/master'
For ical exports, remove X-WR-CALNAME, X-WR-CALID and X-WR-CALDESC. X-WR-CALNAME caused Outlook to create a new calendar on every import. These properties are not neccessary and not specified by RFC5545 anyways. Fixes #109, closes #132.
don't use annotation storage for Location, Attendees and Contact