generator-wp-underscores 
A very simple Yeoman generator for WordPress starter theme _s.
Getting Started
Install Yeoman
npm install -g yo
Install generator-wp-underscores
npm install -g generator-wp-underscores
Create a folder in your WordPress themes folder and initiate the generator
mkdir theme-name && cd $_
yo wp-underscores
Answer some questions in the prompt and you're done!
Run
grunt
to watch .scss files and live reload!
Note: live reload works only if you're working on localhost, 192.168.50.4, or an URL ending in .dev