fix build for non-browser modules

index.js

@@ -92,6 +92,10 @@ function startGulp(name, opts) {
     gulp.task('test', ['test:node']);
   }
 
+  gulp.task('noop', function() {
+    return gutil.noop();
+  });
+
   /**
    * file generation
    */
@@ -288,7 +292,7 @@ function startGulp(name, opts) {
       // Run tests with gulp test
       'test',
       // build browser files
-      'browser',
+      browser ? 'browser' : 'noop',
       // Update package.json and bower.json
       bumper,
       // Commit 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "bitcore-build",
-  "version": "0.5.3",
+  "version": "0.5.4",
   "description": "A helper for common tasks to build bitcore modules'",
   "main": "index.js",
   "scripts": {