async support

[mariusGundersen]

It would be great if this had async support, for example:

gulp.src('*.js')
.pipe(map(function(content, filename, done){
  doSomethingAsync(content, function(err, result){
    done(result);
  });
}))
.pipe(gulp.dest('output'))

[battlesnake]

Agreed!

[nelsonpecora]

I eventually forked this project and added the async support it, here.