Sabre-Zarafa 0.23

• Update to be compatible with SabreDAV 2.1

Sabre-Zarafa 0.22.4

In release 0.22.3, forgot to change the version number in the code itself. Fix and re-release.

Sabre-Zarafa 0.22.3

• VCard\Parser: fix class declaration error (Issue #24)
• VCard\Producer: distinguish between vCard 3 and 4 phone preference formats;
• VCard\Producer: distinguish between vCard 3 and 4 email preference formats;