ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew update
brew doctor
brew install node
or
brew upgrade node
Install Gulp (http://gulpjs.com/) & Bower (http://bower.io/)
npm install --global gulp
npm install --global bower
cd ~/workspace/project_folder/learn-angular
npm install
bower install
Have Fun!