code: function compileFile( sourceBundle, bundleFile, config, callback ) {
  	var fname = sourceBundle + "/bundle.json";
  	fs.readFile(fname, 'utf8', function (err,data) {
  		if (err) {
  			console.error("Unable to load file",fname);
  			if (callback) callback( err, null );
  			return;
  		}
  
  		// Update path if missing
  		if (!config['path'])
  			config['path'] = path.dirname( sourceBundle );
  
  		// Compile
  		compile( JSON.parse(data), bundleFile, config, callback );
  
  	});
  }
docs: Wrapper function for the compile function, that first loads the
  bundle specs from the source bundle file specified.