title: Why does "build" not generate an APK but the run icon does?
body: <p>Using Android Studio 1.4, whenever I Build->Make Project (Ctrl + F9) or make module 'app' for my app, no apk is generated. However, when I click the run icon, an apk is generated. Why is this? What needs to be done in order to get Android Studio to build an apk whenever I use build?</p>
  
  <p>For reference, this is a simple "Hello World" application created with a single activity via the new application wizards.</p>