If you are using the SASS child theme in your DevDmBootstrap3 project there are a few things you’ll need to know about compiling it. There are also a couple important notes.
Use an external SASS compiler. I like http://koala-app.com/. Simply open Koala and drag in the /sass directory. It will compile/watch bootstrap.scss and in the included scss files for changes. Start editing the boostrap scss files that are being pulled in bootstrap.scss and your changes will be compiled automatically into the css/bootstrap.css. Simple.
I’ve included a package.json file so you can simply cruise to the directory in your dev environment and run the ole “npm update.” Once it is done pulling down the dependencies just run “grunt” and it will automatically start the watcher and compiler. Minimize that window and get to work customizing the bootstrap scss files. It will compile into the css/bootstrap.css as you make changes.
This is a pretty standard workflow that most advanced SASS users are used to. If you don’t know what nodeJS is (it can be a pain to get it all setup) just use an external compiler as described in Option 1. You will have the same outcome and it is much easier if nodeJS isn’t in your current workflow.