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/bookmark/test/marionette/fixtures/app.html

@@ -0,0 +1,12 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>My App Title</title>
+  <link rel="manifest" href="manifest.json">
+</head>
+<body>
+  <header><h1>App</h1></header>
+  <section>I am an app</section>
+</body>
+</html>

gaia/apps/bookmark/test/marionette/fixtures/manifest.json

@@ -0,0 +1,11 @@
+{
+  "name": "My App Name",
+  "short_name": "My App Shortname",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64",
+      "type": "image/png"
+    }
+  ]
+}