stevelacy/gulp-stylus — pull request #50 by yhsiang (2014-05-25 12:14:34+00:00)
Title: callback after emit error

if use gulp-plumber it will stop watching because halt from emit error.

the condition code is like below
```
var plumber = require('gulp-plumber');
gulp.task('build', function(){
gulp.src('*.styl')
.pipe(plumber())
.pipe(gulp-stylus())
.pipe(gulp-dest('.'))
});

gulp.task('watch', function(){
gulp.watch('*.style', 'build')
});
```