title: Invalid layout param (layout_alignParentBottom) in TabLayout
body: <p>I am trying to put <code>TabLayout</code> on the bottom of the screen. Trying to use <code>layout_alignParentBottom</code> but get an invalid layout param error. Any param I should use? Thanks.</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      xmlns:app="http://schemas.android.com/apk/res-auto"
      xmlns:tools="http://schemas.android.com/tools"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:orientation="vertical"
      tools:context=".TabBar"&gt;
  
      &lt;android.support.design.widget.TabLayout
          android:id="@+id/tabs"
          android:layout_width="match_parent"
          android:layout_height="wrap_content"
          app:tabGravity="fill"
          app:tabMode="fixed"
          android:layout_alignParentBottom="true" /&gt;
  
      &lt;FrameLayout
          android:id="@+id/frame_container"
          android:layout_width="match_parent"
          android:layout_height="match_parent" /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>