routing: Better generate URLs according to the site configuration. This fixes problems now that even the chef server generates URLs that are appropriate given the `pretty_urls` and `trailing_slash` settings. Add some tests.

#!/bin/sh

CHEF_DIR=`dirname $0`
if `hash readlink 2>&-`; then
    LINKED_EXE=`readlink $0`
    if [ -n "$LINKED_EXE" ]; then
        CHEF_DIR=`dirname $LINKED_EXE`
    fi
fi
python $CHEF_DIR/../chef.py $@