title: Gradle plugin google-services does not work with gradle-experimental:0.6.0-alpha7
body: <p>I want to use gradle-experimental:0.6.0-alpha7 to use the NDK build integration in Android Studio 1.5.1.
  But now my google-services.json is not converted anymore to for instance a R.xml.global_tracker for analytics.</p>
  
  <p>I use </p>
  
  <pre><code>classpath 'com.android.tools.build:gradle-experimental:0.6.0-alpha7'
  classpath 'com.google.gms:google-services:2.0.0-alpha6' 
  </code></pre>
  
  <p>in my global build.gradle and </p>
  
  <pre><code>apply plugin: 'com.android.model.application'
  apply plugin: 'com.google.gms.google-services'
  </code></pre>
  
  <p>on top of my app gradle file.</p>
  
  <p>The com.google.gms:google-services plugin used to work when I used com.android.tools.build:gradle:1.5.0 but now R.xml.global_tracker cannot be found and when I manually set the tracker ID it doesn't track anything.</p>
  
  <p>Is there a combination of the google services gradle plugin and gradle experimantal that works?</p>