title: Angular: app.run() mandatory or optional?
body: <p>app.run is supposed to be Angular's silbling to a Java <code>main</code> function. But is it mandatory or optional?</p>
  
  <p>See also: <a href="https://stackoverflow.com/questions/20663076/angularjs-app-run-documentation">AngularJS app.run() documentation?</a></p>