base: Create css block in base template
base: Add jQuery UI with more functionality
cal: Unauthorized message on failed auth.
cal: Require login on index page
cal: Fix and simplify CalDAV proxying
cal: Proxy collections, some refactoring
cal: Better __unicode__ for DavObject
cal: Add admin.py
cal: Fix CalDavObject.has_access
cal: Fix CalDavObject.has_access (again)
cal: Allow REPORT and OPTIONS for read access in CalDAV
cal: Allow OPTIONS on collections
cal: Rename CALDAV_BASE_URL to CALDAV_DISPLAY_URL
cal: Fix public access of calendars
cal: Fix access check for missing auth
cal: Add calendar access methods to models
cal: Implement simple web calendar
Update requirements
cal: Sync calendars on index view
cal: Fix Calendar.sync method