Return all packages from database.Packages

Don't remove directories when converting the output from the Redis script to
[]Package.

Fixes #339
diff --git a/database/database.go b/database/database.go
index 18ab428..259ce17 100644
--- a/database/database.go
+++ b/database/database.go
@@ -625,7 +625,7 @@
 	if err != nil {
 		return nil, err
 	}
-	pkgs, err := packages(reply, false)
+	pkgs, err := packages(reply, true)
 	sort.Sort(byPath(pkgs))
 	return pkgs, err
 }