Fixes to the `cache` Jinja tag. * Thread safety, since it stores common data potentially coming from pages baked at the same time. * Correctly capture and restore modifications made to the execution context (e.g. sources used in the captured section).

#!/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 $@