Added CalendarRoot for forward compatbility.
Bumped version.
Using class_alias instead.
Only marking iCalendar objects as modified when they generate scheduling
messags.

Fixes #547.
Updated changelog.
Support REDIRECT_REMOTE_USER.

Fixes #558.
Going to release this version as stable.
Depending on a stable vobject again.
Updated changelog.
Test for EmailAddressSet
Ensuring that the sync-token field gets initialized with a value.
Merge branch '2.0' into 2.1

Conflicts:
	ChangeLog.md
	lib/CalDAV/CalendarRoot.php
	lib/DAV/Version.php
Ensuring that the sync-token field gets initialized with a value.
Merge branch '2.0' of github.com:fruux/sabre-dav into 2.0
Merge branch '2.0' into 2.1
Release date set.