CBLT-181:  zip up "Documentation" instead of "com.couchbase.CouchbaseLite.docset"

Change-Id: I0a7a1166e121dc2989a556a1090bb2faba1e2e68
Reviewed-on: http://review.couchbase.org/35279
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Eric Limare <eric.limare@couchbase.com>