Gulp tasks

[JosefJezek]

• [ ] https://github.com/chmontgomery/gulp-help
• [ ] https://github.com/postcss/gulp-postcss
  • https://github.com/postcss/sugarss
• [ ] https://github.com/gucong3000/gulp-reporter
• [ ] https://github.com/MaKleSoft/polymer-iconset-generator