Node port: export as UMD to support use in code

[peacechen]

It would be great for this library to use UMD, allowing support for Node, browser and script injection. For example, I'd like to use it in code like this:

var jsonMinify = require("node-json-minify");

// someJSONstring is a string in JSON format
let realJSON = jsonMinify(someJSONstring);

[getify]

There is a node port using commonjs: https://github.com/getify/JSON.minify/tree/node

And there's a standard .js file port for use in browsers: https://github.com/getify/JSON.minify/tree/javascript

Not sure of there being a benefit to a single UMD format when both those already exist.

[peacechen]

That should do the job. It would reduce maintenance to publish one package that can run on Node, browser module, or script injection (plus AMD). Fewer merges to the multiple branches that aren't really necessary when the core code is identical.