`service del` takes service ids as parameters

src/service.cr

@@ -90,7 +90,14 @@ commands.push "add", "Adds a service to an environment." do |args|
 end
 
 commands.push "del", "Removes a service from an environment." do |args|
-	Service.new(args[0], args[1]?).remove RC_DIRECTORY
+	if args.size < 1
+		STDERR.puts "usage: service del <id> [id [...]]"
+		exit 1
+	end
+
+	args.each do |id|
+		Service.get_by_id(id).try &.remove RC_DIRECTORY
+	end
 end
 
 commands.push "start", "Starts a service." do