Auto install (preinstall) grunt-cli from package.json

package.json

{
  "name": "Project name",
  "version": "0.0.0",
  "author": "Author name",
  "scripts": {
    "preinstall": "which -s grunt && grunt --version | grep grunt-cli > /dev/null 2>&1; if [[ \"$?\" != 0 ]]; then npm install grunt-cli -g; exit 0; fi"
  },
  "devDependencies": {
    "grunt": "~0.4.1"
  }
}