Expose repl callback for async behavior

[DesignByOnyx]

The built in REPL module lets you call a callback asyncronously:

https://nodejs.org/api/repl.html#repl_custom_evaluation_functions

You should expose the callback somehow so that async operations can take place.

[nbu]

Thanks for suggestion. I will consider this.

[nbu]

Hi, start looking into this. Not sure I understand correctly your proposition. Are you suggesting custom evaluation function for Node.js REPL module, or you suggesting to implement custom parser for users input to not force exact input format?