Create a WordPress theme with grunt-init.
If you haven't already done so, install grunt-init.
Once grunt-init is installed, place this template in your ~/.grunt-init/ directory. It's recommended that you use git to clone this template into that directory, as follows:
git clone git@github.com:iamntz/grunt-base.git ~/.grunt-init/ntz-base
git clone git@github.com:iamntz/grunt-base.git %USERPROFILE%/.grunt-init/ntz-base
At the command-line, cd into an empty directory, run this command and follow the prompts.
grunt-init ntz-base