[kronolith] minimum horde version for kron 2.0

[Ryan McDonald]

What is the minimum version of horde that can support kron2.0?  I 
noticed that horde 2.2.1 is missing /lib/Image.php that kron 2.0 is 
looking for.  Is the only option for supporting Kron 2.0 the CVS head 
branch of horde?  Someone talk me out of putting head versions of kron 
and horde into production use please.  This noob trying to resist the 
temptation because he is lusting over shared calendars.

-Ryan