Bourne is not bash

see http://shebang.brandonmintern.com/bourne-is-not-bash-or-read-echo-and-backslash/

Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
Merge branch 'issue_191' of https://github.com/asteven/cdist
++changes

Signed-off-by: Nico Schottelius <nico@bento.schottelius.org>