Changes to 'dev/recurrence-exceptions'

[Thomas Brüderli]

New branch 'dev/recurrence-exceptions' available with the following commits:
commit 91779df09a5a19d7a4a401d8f5c556b6cf6fa8d6
Author: Thomas Bruederli <bruederli at kolabsys.com>
Date:   Wed Jan 23 14:45:41 2013 +0100

    Save changes in a recurring event as exception to the master event

commit 53c77796dd555ce573130a9f0a3ea04abda94f39
Author: Thomas Bruederli <bruederli at kolabsys.com>
Date:   Wed Jan 23 11:36:55 2013 +0100

    Add fallback for recurrence computation when the kolabcalendaring php module isn't available