gulp.watch('app/css/*.css', ['csscomb']);
gulp.watch('app/css/*.css', browserSync.reload);
gulp.task('csscomb', function(){
return gulp.src('app/css/*.css')
.pipe(csscomb())
.pipe(gulp.dest('app/css/'))
.pipe(browserSync.reload({stream: true}));
});
gulp.task('watch', ['browser-sync'], function(){
gulp.watch('app/css/*.css', ['csscomb']);
gulp.watch('app/*.html', browserSync.reload);
});