* Improve error handling in the snapshot archive packing/unpacking code. Specificially, when a build slave fails to unpack a snapshot it received from the master, it'll report the error back to the master (and thereby reject the build request), instead of just bailing and leaving the master waiting for a reply. * Host names of slaves are now lower-cased (some windows machines would report the host all upper-case). * Minor fixes to some of the recipe commands.

include COPYING