Node 4 Compatibility and Auto-Resolve Disabler

Fix compatibility with Node 4 and add .enable and .disable keyword to control the promise auto-resolve functionality

Fix NODE_ENV=production behavior

Add functionality to crash applicaiton when invoking RE-PL in production environment (NODE_ENV=production).

Node.js RE-PL first release

In this release, you can use REPL to stop current async operation with Promises or Generator Function and automatic promise resolution for better promise handling on terminal. See README.md for usage and more information.