docs: plugin 1.2.0 revision updates

<p>For a summary of known issues in Android Plugin for Gradle, see <a

href="http://tools.android.com/knownissues">http://tools.android.com/knownissues</a>.</p>

<div class="toggle-content opened">

  <p><a href="#" onclick="return toggleContent(this)">

    <img src="{@docRoot}assets/images/triangle-opened.png" class="toggle-content-img"

      alt=""/>Android Plugin for Gradle, Revision 1.2.0</a> <em>(April 2015)</em>

  </p>

  <div class="toggle-content-toggleme">

    <dl>

    <dt>Dependencies:</dt>

    <dd>

      <ul>

        <li>Gradle 2.2.1 or higher.</li>

        <li>Build Tools 21.1.1 or higher.</li>

      </ul>

    </dd>

    <dt>General Notes:</dt>

    <dd>

      <ul>

      <li>Enhanced support for running unit tests with Gradle.  </li>

        <ul>

          <li>Added support to include Java-style resources in the classpath when running unit

            tests directly from Gradle.

          </li>

          <li>Added unit test dependency support for Android ARchive (AAR) artifacts.

          </li>

          <li>Added support for the <code>unitTestVariants</code> property so unit test variants

            can be manipulated using the <code>build.gradle</code> file.

          </li>

          <li>Added the <code>unitTest.all</code> code block under <code>testOptions</code> to

            configure customized tasks for unit test. The following sample code shows how to add

            unit test configuration settings using this new option:

<pre>

android {

  testOptions {

    unitTest.all {

      jvmArgs '-XX:MaxPermSize=256m' // Or any other gradle option.

    }

  }

}

</pre>

           </li>

          <li>Fixed the handling of enums and public instance fields in the packaging of the

           <code>mockable-android.jar</code> file.

          </li>

          <li>Fixed library project task dependencies so test classes recompile after changes.

          </li>

          </ul>

        <li>Added the <code>testProguardFile</code> property to apply

          <a href="{@docRoot}tools/help/proguard.html">ProGuard</a> files when minifying a test APK.

        </li>

        <li>Added the <code>timeOut</code> property to the <code>adbOptions</code> code block

          for setting the maximum recording time for

          <a href="{@docRoot}tools/help/adb.html">Android Debug Bridge</a> screen recording.

        </li>

        <li>Added support for 280 dpi resources.

        </li>

        <li>Improved performance during project evaluation.

        </li>

     </ul>

    </dd>

  </div>

</div>

<div class="toggle-content closed">

  <p><a href="#" onclick="return toggleContent(this)">

    <img src="{@docRoot}assets/images/triangle-closed.png" class="toggle-content-img"

      alt=""/>Android Plugin for Gradle, Revision 1.1.3</a> <em>(March 2015)</em>

  </p>