Updating examples for Planet 2 package system
chapter 6 second part of java clone example
Merge pull request #383 from jeapostrophe/master

Updating examples for new Racket package system
Add Node.js version of `identity` example
Merge pull request #384 from BinaryMuse/nodejs_identity

Add Node.js version of "identity" example
Merge pull request #326 from miniway/master

chapter 6 second part of java clone example
fix for #386