• Added: createFile and put() can now return an ETag.
• Added: Sending back an ETag on for operations on CardDAV backends. This should
  help with OS X 10.6 Addressbook compatibility.
• Fixed: Fixed a bug where an infinite loop could occur in the recurrence
  iterator if the recurrence was YEARLY, with a BYMONTH rule, and either BYDAY
  or BYMONTHDAY match the first day of the month.
• Fixed: Events that are excluded using EXDATE are still counted in the COUNT=
  parameter in the RRULE property.
• Added: Support for time-range filters on VALARM components.
• Fixed: Correctly filtering all-day events.
• Fixed: Sending back correct mimetypes from the browser plugin (thanks
  Jürgen).
• Fixed: Issue 195: Sabre_CardDAV pear package had an incorrect dependency.
• Fixed: Calendardata would be destroyed when performing a MOVE request.