title: Support Fragment pop animation is not working
body: <p>I am using v4 support fragments in my app. I have an activity where the user could see more info by clicking a button. The information screen should slide up from bottom, covering the activity and when the back is pressed, slides down. This is the code I am using at the moment</p>
  
  <pre><code>FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
                      ft.setCustomAnimations(
                               R.anim.fragment_bottom_enter, 
                               R.anim.fragment_bottom_exit,                                  
                               R.anim.fragment_bottom_exit, 
                               R.anim.fragment_bottom_exit
                      );                 
                      ft.replace(R.id.fragmentContainer, fragment, TAG);
                      ft.addToBackStack(null);
                      ft.commit();
  </code></pre>
  
  <p><strong>fragment_bottom_enter.xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;set xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;translate
          android:duration="500"
          android:fillAfter="true"
          android:interpolator="@android:anim/accelerate_interpolator"
          android:fromYDelta="100%p"
          android:toYDelta="0%p" /&gt;
  &lt;/set&gt;
  </code></pre>
  
  <p><strong>fragment_bottom_exit.xml</strong></p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;set xmlns:android="http://schemas.android.com/apk/res/android"&gt;
      &lt;translate
          android:duration="500"
          android:fillAfter="true"
          android:fromYDelta="0%p"
          android:interpolator="@android:anim/accelerate_interpolator"
          android:toYDelta="100%p" /&gt;
  &lt;/set&gt;
  </code></pre>
  
  <p>The above is working for the enter animation (the fragment slides from bottom as expected). But the pop animation is never played. I even tried with android's built in fade in and fade out animations to no avail. Any help on resolving this would be much appreciated.</p>