Add Common.JS / Node.js module support to models

[DanielApt]

Allow models to either be loaded via a script tag:

<script src="models/model_pca_10_mosse.js"></script>

or via CommonJS / Node.js modules

// Without ES6 support
var pModule = require('models/model_pca_10_mosse');

// With ES6 support
import pModule from 'models/model_pca_10_mosse';

As Github's UI does not allow viewing such large files, the summary of the change looks as follows:

Before

var pModel = {...};

After

(function (global) {
  'use strict';

  var pModel = {...};

  // CommonJS and Node.js module support
  if (typeof exports !== 'undefined') {
    // Support Node.js specific `module.exports` (which can be a function)
    if (typeof module !== 'undefined' && module.exports) {
      exports = module.exports = pModel;
    }
    // But always support CommonJS module 1.1.1 spec (`exports` cannot be a function)
    exports.pModel = pModel;
  } else {
    // No CommonJS or Node.js module support, export to the global (window)
    global.pModel = pModel;
  }
})(this);

[auduno]

Thanks very much for the PR! This has now been manually merged into master with this commit. Github does not manage to resolve that to this pull request, so I'll have to close this manually.