brew install skinny node: Beginning with 0.8.0, this recipe now comes with npm. It appears you already have npm installed at /usr/local/lib/node_modules/npm. To use the npm that comes with this recipe, first uninstall npm with `npm uninstall npm -g`, then run this command again. If you would like to keep your installation of npm instead of using the one provided with homebrew, install the formula with the `--without-npm` option. Error: An unsatisfied requirement failed this build.
npm uninstall npm -g