title: Analytics broken on Marshmallow?
body: <p>I'm using analytics and while compiling I get this proguard warnings:</p>
  
  <pre class="lang-none prettyprint-override"><code>Warning: com.google.android.gms.internal.zzw$zza: can't find superclass or interface org.apache.http.client.methods.HttpEntityEnclosingRequestBase
  Warning: com.google.android.gms.analytics.internal.zzam: can't find referenced class org.apache.http.NameValuePair
  Warning: com.google.android.gms.analytics.internal.zzam: can't find referenced class org.apache.http.client.utils.URLEncodedUtils
  </code></pre>
  
  <p><sup>and much more.</sup></p>
  
  <p>I'm using these dependencies:</p>
  
  <pre class="lang-gradle prettyprint-override"><code>compile 'com.google.android.gms:play-services-base:7.8.0'
  compile 'com.google.android.gms:play-services-gcm:7.8.0'
  </code></pre>
  
  <p>Is this a bug? Is there any workaround for that?</p>