lit-node

By loading lit-node as a module instead of via a special interpreter or REPL, it becomes possible to do literate programming in Markdown using standard Node commands. However, as originally designed, lit-node also transparently wraps imported modules in an async function, which is convenient but also subtly changes the runtime behavior in a way that will be quite unexpected for users who are running lit-node as a module using the regular interpreter. Perhaps this behavior should be removed in pursuit of consistency.