Moved away from the DIRT placeholder and empty itemstacks, added the NULL checks that go with that (which fixes shops selling/buying "nothing" when no items are defined in the seller), removed support for maxitemstacksize in 1.4.6 and above which decouples SS from CraftBukkit from 1.4.6 and up and moved to 2.5.3Dev as 2.5.2 final has been released.