Production builder and development loader for class/path/Name

[mdittmer]

FOAM2 does not yet load models automagically (though FOAM1 did, to degrees). Here are some feature requests for a builder/loader:

• Custom multiple-fallback classpath
• Custom extension
• Module-import configuration map

E.g.,

BuilderOrLoader.create({
  classpath: [ 'p/1', 'p/2' ],
  extensions: [ 'es6.js', 'js', 'legacy.js' ],
  modules: [
    {
      'classpath/relative/path/to/foo-module.es6.js': [
        'pkg1.Foo1', 'pkg1.Foo2', 'foo.pkg.*'
      ]
    }
  ]
})