Automate release of npm package

[fred-wang]

I've just published an npm package:

https://www.npmjs.org/package/texzilla

The release.sh script should be able to automate updates of npm package.

[fred-wang]

reopening since the automatic update that didn't work.

[fred-wang]

What's needed here:

• keep only TeXZilla.js and the readme
• add a package.jison file
• call npm publish

[fred-wang]

Also do http://markmarkoh.com/nodejs-npm-and-executables/