added calendar feed
added page for calendar view
Merge branch 'master' into icalendar

* master:
  some restyling, added buttons, etc;
  disabled TZ support
forgot a line of code used for debugging
Merge branch 'master' into icalendar

* master:
  added foreign key field ordering for meetings
Merge branch 'master' into icalendar

* master:
  reversed ordering (for admin mostly)
we need TZ info, but before the django TIME_ZONE was set to UTC. however this leads to problems with generated dates in calendar export.
thus, change to correct TZ
timezone compatibility; simplified the Q filtering to not rely on datetime.min
added tool to convert wrongly UTC encoded databases ex-post to proper UTC times.
proper timezone display in the admin app
use timezone instead of datetime
Merge branch 'master' into icalendar

* master:
  cosmetics
use timezone not datetime
fixed missing TZID in calendar
Merge branch 'master' into icalendar

* master:
  filter for time in upcoming timeslots