title: app:srcCompat does not work for ImageView
body: <p>I'm adding vector drawable support to a library project, and using <code>app:srcCompat</code> to reference the vector drawable. The only view that appears to work is ImageButton and I'm not sure why.</p>
  
  <p>Here's the relevant piece of my build.gradle</p>
  
  <pre><code>android {
    defaultConfig {
      vectorDrawables.useSupportLibrary = true
    }
  }
  
  dependencies {
      testCompile 'junit:junit:4.12'
  
      compile 'com.android.support:appcompat-v7:24.0.0'
      compile 'com.android.support:support-vector-drawable:24.0.0'
      compile 'com.android.support:animated-vector-drawable:24.0.0'
      compile 'uk.co.chrisjenx:calligraphy:2.2.0'
  }
  </code></pre>
  
  <p>Here's my layout file:</p>
  
  <pre><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"
      android:orientation="vertical"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:gravity="center_horizontal"
      &gt;
  
      &lt;ImageView
          android:id="@+id/iconActive"
          style="@style/Widget.MyCompany.Button.Icon"
          app:srcCompat="@drawable/activities"
          android:layout_marginTop="16dp"
          android:tint="@color/white"
          /&gt;
  
  &lt;/LinearLayout&gt;
  </code></pre>
  
  <p>If I simply change the ImageView to an ImageButton it works. Button also does not work.</p>