Simple angularjs structure to follow...
npm install angularjs-simple
Once done, move angularjs-simple folder from the node_modules directory and treat it as your project's root directory.
You can rename 'angularjs-simple' to your project name as this is your project root folder
Then cd into this directory and,
Install Grunt-cli Components
npm install grunt-cli -g
Install node modules
Install bower modules
Run grunt task