render: Don't always use a `.html` extension for layouts. The rendering code now only looks for the extensions explicitely specified by the template engine. To compensate, the Jinja engine specifies `.html` as its last supported extension.

#!/bin/sh

CUR_DIR="$( cd "$( dirname "$0" )" && pwd )"
CHEF=${CUR_DIR}/../bin/chef
OUT_DIR=${CUR_DIR}/../piecrust/resources/messages
ROOT_DIR=${CUR_DIR}/messages

$CHEF --root=$ROOT_DIR bake -o $OUT_DIR
rm ${OUT_DIR}/index.html