This setup uses Gulp for task management, with the aid of PostCSS + Sass for CSS-related tasks.

The Gulpfile has 9 tasks available:

• webserver: starts a local webserver to serve the files
• css: uses PostCSS + cssnext for prefixing and future CSS, and Sass as an aid. It also concatenates all CSS files, and minifies the result
• vendor-css: this task is meant to grab all files inside the array of the task's src and concatenates them into vendor.css and minifies it
• js: grabs all the files inside the scripts folder, concatenates them into all.js, and minifies it
• vendor-js: works exactly like the vendor-css task but for vendor javascript
• clean: this task deletes everything inside the dist filder
• copy-images and copy: these tasks copy all images and HTML/PHP files into the dist folder
• watch: this task watches for changes in the files in the src folder and updates them if necessary
• build: runs all of the tasks once, except for watch and webserver

Please, keep in mind that this setup may not work for you, and it may as well be flawed. I currently use it for small, personal projects and will try to improve its performance and logic ASAP.