app/                --> all of the files to be used in production
  css/              --> css files
    app.css         --> default stylesheet
  img/              --> image files
  index.html        --> app layout file (the main html template file of the app)
  js/               --> javascript files
    app.js          --> the main application module
    controllers.js  --> application controllers
    directives.js   --> application directives
    filters.js      --> custom angular filters
    services.js     --> custom angular services
    animations.js   --> hooks for running JQuery animations with ngAnimate
  partials/         --> angular view partials (partial html templates) used by ngRoute
    partial1.html
    partial2.html
  bower_components  --> 3rd party js libraries, including angular and jquery

scripts/            --> handy scripts
  update-repo.sh       --> pull down the latest version of this repos
                           (BE CAREFUL THIS DELETES ALL CHANGES YOU HAVE MADE)
  private/             --> private scripts used by the Angular Team to maintain this repo
test/               --> test source files and libraries
  karma.conf.js        --> config file for running unit tests with Karma
  protractor-conf.js   --> config file for running e2e tests with Protractor
  e2e/
    scenarios.js       --> end-to-end specs
  unit/             --> unit level specs/tests
    controllersSpec.js --> specs for controllers
    directivesSpec.js  --> specs for directives
    filtersSpec.js     --> specs for filters
    servicesSpec.js    --> specs for services