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Handle default value of [] for clonables.
Speed up server stop by killing processes in parallel.

Squashed commit of the following:

commit 2dbbd85398ea4ba9231df4fe0d48a6a87d7c8757
Author: Oliver Welter <github@oliwel.de>
Date:   Mon Sep 15 20:15:29 2014 +0200

    Fixup Server Stop commit

commit a00cce2e6c08497c6a68e30fea957f820c47a0bb
Author: Andreas Leibl <andreas@leibl.co.uk>
Date:   Mon Sep 15 17:25:18 2014 +0200

    Speed up server stop by killing processes in parallel.
Merge remote-tracking branch 'durko/develop' into develop