Ability to escape slashes

[ejholmes]

Let's say you want a Walkfile that installs homebrew taps:

#!/bin/bash

phase=$1
target=$2

case $target in
  *.tap)
    case $phase in
      exec) brew tap ${target%.tap} ;;
    esac ;;
esac

Now, I want to do something like this:

walk caskroom/cask.tap

walk is going to look in a directory called caskroom and execute the cask.tap target. Maybe we should allow escaping slashes to indicate that it's not really a directory:

walk caskroom\/cask.tap