Add support for node-repl into SCION
Should have a script installed through npm that is a simple, runnable scion shell environment based on node-repl here: https://github.com/jbeard4/scion-demos/tree/master/node-repl
Should have a script installed through npm that is a simple, runnable scion shell environment based on node-repl here: https://github.com/jbeard4/scion-demos/tree/master/node-repl