JSRepl directory not fully installing the first time through

[GoogleCodeExporter]

What steps will reproduce the problem?
1.Installing as specified
2.running start.sh
3.Trying to troubleshoot by deleting the JSRepl directory and running start.sh 
again

What is the expected output? What do you see instead?
Expect to see the JSRepl directory with folders: engines, extern, langs; files: 
jsrepl.js, sandbox.html, sandbox.js.
Instead had only one of the sandbox files.

Please use labels and text to provide additional information.
Sorry I don't have better repo steps than this. I'm not sure what's special 
about my system that's making it fail. However, this happened on both an iMac 
with Yosemite as well as a Macbook Air with Mavericks. The Yosemite machine did 
not have JRE installed the first time through. Both times reinstalling from 
scratch was able to fix the problem.

Note: JSRepl may be deprecated, so may need to replace it anyway.

Original issue reported on code.google.com by maddenw...@gmail.com on 17 Mar 2015 at 12:23