add zip package to ritherdon-archive.asd file.

Used for compressing/zipping up stuff -- most notably the Snapshots so they can
be moved to the Storage Files where users can download them.

ritherdon-archive.asd

@@ -42,6 +42,7 @@
 	       #:str            ; String manipulation (easier than built-in)
                #:copy-directory ; Copy Directories using Native cp
                #:cl-diskspace   ; Get Disk Info.
+               #:zip            ; Zip and compression
 	       )
   :pathname "src/"
   ;; :serial t