Publish Vulpes Preview 15 sources for desktop, Android and Tundra

Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.

gaia/apps/callscreen/test/unit/mock_group_call.html

@@ -0,0 +1,19 @@
+<article id="call-screen" data-layout class="displayed">
+  <article id="calls" data-count="0">
+    <section id="group-call" hidden>
+      <div class="numberWrapper">
+        <div id="group-show"></div>
+        <div id="group-call-label" class="number font-light"></div>
+      </div>
+      <div id="group-call-summary" class="additionalContactInfo font-light"></div>
+      <div class="duration">
+        <span class="font-light"></span>
+        <div class="total-duration"></div>
+        <div class="direction"></div>
+      </div>
+      <button class="merge-button" data-l10n-id="merge">Merge</button>
+    </section>
+  </article>
+  <form is="conference-group-details" id="group-call-details" role="dialog" data-type="action" class="overlay">
+  </form>
+</article>