title: Android ZipAlign does not run on generate signed apk
body: <p>Does anyone have experience with zipalign not running even when explicitly set when building for the store? I am running Android Studio 2.0 beta 2 from canary channel. </p>
  
  <pre><code>signingConfigs {
      release {
          keyAlias 'key'
          keyPassword ''
          storeFile file('location.keystore')
          storePassword ''
      }
  }
  
  buildTypes {
      debug {
          debuggable true
          zipAlignEnabled true
      }
  
      release {
          debuggable false
          zipAlignEnabled true
          signingConfig signingConfigs.release
      }
  }
  </code></pre>
  
  <p>If I build with generate signed apk it won't do zipalign even though it says in my build logs that it does. If I push app to phone and build that way it will sign and do zipalign. The other method of course can be fixed by using <code>zipalign -c -v 4 unaligned.apk aligned.apk</code> so was just wondering if there was something I was missing with generated signed apk.</p>