Remove 'exports' from declaration of globals
Add scope-level3-nodejs, variant of CommonJS for Node.js

Instead of the setting the exported module in a property of the same name,
in CommonJS style, the Node.js variant sets the exported module directly
to the exports:

    require('log').log( "CommonJS style" );
    // vs
    require('log')( "Node.js style" );

For the implementation of this variant, the module exports are set right
after the definition of the module, by accessing the module from the cache
in require.cache and setting the property 'exports' of the cached module.