make stdout output possible

browser/build.js

@@ -140,13 +140,14 @@ if (require.main === module) {
     .version('0.0.1')
     .option('-a, --includeall', 'Include all submodules.')
     .option('-d, --dontminify', 'Don\'t minify the code.')
+    .option('-o, --stdout', 'Specify output as stdout')
     .option('-s, --submodules <items>', 'Include the listed comma-separated submodules.', list)
     .parse(process.argv);
   var bitcoreBundle = createBitcore(program);
   var testBundle = createTestData(program);
 
   testBundle.pipe(fs.createWriteStream('browser/testdata.js'));
-  bitcoreBundle.pipe(fs.createWriteStream('browser/bundle.js'));
+  bitcoreBundle.pipe(program.stdout ? process.stdout : fs.createWriteStream('browser/bundle.js'));
 }
 
 module.exports.createBitcore = createBitcore;