$ npm install grunt-grunticon --save-dev
/
> gifsicle@3.0.1 postinstall /Users/craig/Development/Project/es-fe-angular-ui/node_modules/grunt-grunticon/node_modules/grunticon-lib/node_modules/svg-to-png/node_modules/imagemin/node_modules/imagemin-gifsicle/node_modules/gifsicle
> node lib/install.js
✔ gifsicle pre-build test passed successfully
> pngquant-bin@3.0.0 postinstall /Users/craig/Development/Project/es-fe-angular-ui/node_modules/grunt-grunticon/node_modules/grunticon-lib/node_modules/svg-to-png/node_modules/imagemin/node_modules/imagemin-pngquant/node_modules/pngquant-bin
> node lib/install.js
✔ pngquant pre-build test passed successfully
> optipng-bin@3.0.2 postinstall /Users/craig/Development/Project/es-fe-angular-ui/node_modules/grunt-grunticon/node_modules/grunticon-lib/node_modules/svg-to-png/node_modules/imagemin/node_modules/imagemin-optipng/node_modules/optipng-bin
> node lib/install.js
✔ optipng pre-build test passed successfully
> jpegtran-bin@3.0.4 postinstall /Users/craig/Development/Project/es-fe-angular-ui/node_modules/grunt-grunticon/node_modules/grunticon-lib/node_modules/svg-to-png/node_modules/imagemin/node_modules/imagemin-jpegtran/node_modules/jpegtran-bin
> node lib/install.js
✔ jpegtran pre-build test passed successfully
npm ERR! Darwin 14.4.0
npm ERR! argv "node" "/usr/local/bin/npm" "install" "grunt-grunticon" "--save-dev"
npm ERR! node v0.12.6
npm ERR! npm v2.12.1
npm ERR! code E404
npm ERR! 404 Not Found: @filamentgroup/worker-farm
npm ERR! 404
npm ERR! 404 '@filamentgroup/worker-farm' is not in the npm registry.
npm ERR! 404 You should bug the author to publish it (or use the name yourself!)
npm ERR! 404 It was specified as a dependency of 'directory-colorfy'
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.
npm ERR! Please include the following file with any support request:
npm ERR! /Users/craig/Development/Project/es-fe-angular-ui/npm-debug.log
.npmrc
that pointed to our cache - and then all was happy again.