title: Android studio Gradle icon error, Manifest Merger
body: <p>I keep seeing this message and not sure how to solve it for good.</p>
  
  <pre><code>Error:(43, 9) Attribute application@icon value=(@drawable/new_app_icon) from AndroidManifest.xml:43:9
      is also present at com.github.erizet.signala:signala-longpolling:0.20:7:18 value=(@drawable/ic_launcher)
      Suggestion: add 'tools:replace="android:icon"' to &lt;application&gt; element at AndroidManifest.xml:40:5 to override
  :OpenBook:processDebugManifest FAILED
  Error:Execution failed for task ':OpenBook:processDebugManifest'.
  &gt; Manifest merger failed with multiple errors, see logs
  </code></pre>
  
  <p>Tried adding <code>android:replace="android:icon"</code> to my manifest even with my icon.</p>
  
  <p>I tried deleting the  <code>android:icon="@drawable/ic_launcher</code> from the library but it keeps coming back when i build because its imported from maven</p>
  
  <p>Any ideas ?</p>