Migrate into Gulp.

gulpfile.js

@@ -0,0 +1,71 @@
+'use strict';
+
+var gulp = require('gulp')
+  , bump = require('gulp-bump')
+  , jshint = require('gulp-jshint')
+  , rename = require('gulp-rename')
+  , rimraf = require('gulp-rimraf')
+  , sass = require('gulp-sass')
+  , uglify = require('gulp-uglify');
+
+gulp.task('lint', function () {
+  return gulp.src(['./src/**/*.js', './gulpfile.js'])
+    .pipe(jshint())
+    .pipe(jshint.reporter('default'));
+});
+
+gulp.task('clean:js', function () {
+  return gulp.src('./out/perfect-scrollbar.js', {read: false})
+    .pipe(rimraf());
+});
+
+gulp.task('uglify', ['clean:js'], function () {
+  return gulp.src('./src/perfect-scrollbar.js')
+    .pipe(uglify())
+    .pipe(rename('perfect-scrollbar.min.js'))
+    .pipe(gulp.dest('./out'));
+});
+
+gulp.task('clean:css', function () {
+  return gulp.src('./out/perfect-scrollbar.css', {read: false})
+    .pipe(rimraf());
+});
+
+gulp.task('sass', ['clean:css'], function () {
+  return gulp.src('./src/perfect-scrollbar.scss')
+    .pipe(sass())
+    .pipe(gulp.dest('./out'));
+});
+
+gulp.task('clean:css:min', function () {
+  return gulp.src('./out/perfect-scrollbar.css', {read: false})
+    .pipe(rimraf());
+});
+
+gulp.task('sass:min', ['clean:css:min'], function () {
+  return gulp.src('./src/perfect-scrollbar.scss')
+    .pipe(sass({outputStyle: 'compressed'}))
+    .pipe(rename('perfect-scrollbar.min.css'))
+    .pipe(gulp.dest('./out'));
+});
+
+function bumpType() {
+  if (gulp.env.major) {
+    return 'major';
+  } else if (gulp.env.minor) {
+    return 'minor';
+  } else {
+    return 'patch';
+  }
+}
+
+gulp.task('bump', function () {
+  gulp.src('./*.json')
+    .pipe(bump({type: bumpType()}))
+    .pipe(gulp.dest('./'));
+});
+
+gulp.task('release', ['bump', 'build']);
+
+gulp.task('build', ['uglify', 'sass', 'sass:min']);
+gulp.task('default', ['lint', 'build']);