code: function initialize(done) {
  		debug('prepare');
  
  		parser(options.index, options, function(err,  modules) {
  			if(err) return done(err)
  
  			debug('Parser return, now build the tree...');
  			tree          = buildTree(options, modules, true);
  
  			debug('Tree builded');
  
  			// Extract from tree as a flatten list of packets to compile
  			packets       = tree.getAllBundles(options);
  
  			done(null);
  		})
  
  	}
docs: BUILD FLOW 
  Step 1
  
  Prepare builder information using nway.prepare() :
  modules object, root module, sources, tree and packet list
  
  @api private