add refresh button to calender controls
click on view buttons will re fetch the events. #357
refresh events every 5 minutes. also make today button refresh events if needed.
Merge branch 'master' of github.com:owncloud/calendar
Merge branch 'master' of github.com:owncloud/calendar
Merge pull request #357 from wtayyeb/master

add auto-refresh to calender and controls