title: Upgrading from Play Services 7.5 to 7.8 - GCM APIs not found
body: <p>Upgraded from 7.50 -> 7.8.0, then Android Studio could not find the GCM classes. Reverting to 7.5.0 fixes the issue.</p>
  
  <p><code>7.5.0</code> lets Android Studio locate <code>InstanceID</code> and other GCM classes, but after upgrading the version number to <code>7.8.0</code>, those GCM classes cannot be found.</p>
  
  <p>using the gradle code below. <code>playServicesVersion = '7.5.0'</code> works, but <code>playServicesVersion = '7.8.0'</code> does not.</p>
  
  <pre><code>    compile "com.google.android.gms:play-services-base:$playServicesVersion"
      compile "com.google.android.gms:play-services-appinvite:$playServicesVersion"
      compile "com.google.android.gms:play-services-analytics:$playServicesVersion"
      compile "com.google.android.gms:play-services-gcm:$playServicesVersion"
  </code></pre>
  
  <p>Anyone else having this issue?</p>