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/ftu/test/unit/mock_navigation_index.html

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+<gaia-header>
+    <h1 id="main-title"></h1>
+    <button id="wifi-refresh-button" data-l10n-id="refresh">Refresh</button>
+</gaia-header>
+<section id="unlock-sim-screen" role="region" class="skin-organic">
+    <gaia-buttons>
+        <button id="skip-pin-button" class="button-left" data-l10n-id="skip">
+            Skip
+        </button>
+        <button id="back-sim-button" class="button-left back hidden" data-l10n-id="back">
+            Back
+        </button>
+        <button id="unlock-sim-button" class="recommend" data-l10n-id="send">
+            Send
+        </button>
+    </gaia-buttons>
+</section>
+<section id="activation-screen" role="region" class="skin-organic no-options">
+    <article>
+        <section id="languages">
+            <ul>
+                <!-- filled by js/language.js -->
+            </ul>
+        </section>
+        <section id="wifi">
+            <div id="wifi-wrapper">
+                <article id="networks">
+                </article>
+                <button id="join-hidden-button">
+                    Join hidden network
+                </button>
+            </div>
+        </section>
+    </article>
+    <gaia-buttons id="nav-bar" class="forward-only">
+        <button id="back" class="button-left back">
+            Back
+            <span></span>
+        </button>
+        <button class="recommend forward" id="forward">
+            Next
+            <span></span>
+        </button>
+        <button class="recommend" id="wifi-join-button">
+            Join
+        </button>
+    </gaia-buttons>
+    <a href="https://www.mozilla.org/privacy/firefox-os/"
+    class="external" title="URL title">url text</a>
+    <section role="region" id="sharing-performance-data">
+    </section>
+    <section role="region" id="browser_privacy">
+    </section>
+    <section role="region" id="welcome_browser">
+        <gaia-checkbox id="share-performance"></gaia-checkbox>
+    </section>
+</section>
+<section id="finish-screen" role="region">
+</section>
+<section id="tutorial-screen" role="region">
+</section>
+<section id="external-url-loader" class="external">
+</section>