docs: Added release notes for SDK Tools 22.6.4

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

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

      alt=""/>SDK Tools, Revision 22.6.4</a> <em>(June 2014)</em>

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    <dl>

    <dt>Dependencies:</dt>

    <dd>

      <ul>

        <li>Android SDK Platform-tools revision 18 or later.</li>

        <li>If you are developing in Eclipse with ADT, note that this version of SDK Tools is

          designed for use with ADT 22.6.3 and later. If you haven't already, update your

        <a href="{@docRoot}tools/sdk/eclipse-adt.html">ADT Plugin</a> to 22.6.3.</li>

        <li>If you are developing outside Eclipse, you must have

          <a href="http://ant.apache.org/">Apache Ant</a> 1.8 or later.</li>

      </ul>

    </dd>

    <dt>General Notes:</dt>

    <dd>

      <ul>

        <li>Fixed an issue with the x86 emulator that caused Google Maps to crash.

            (<a href="http://b.android.com/69385">Issue 69385</a>)</li>

        <li>Fixed minor OpenGL issues.</li>

      </ul>

    </dd>

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

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

      alt=""/>SDK Tools, Revision 22.6.3</a> <em>(April 2014)</em>

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