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/dev_apps/in_app_pay_test/index.html

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+<html>
+  <head>
+    <title>In-App Payments Tester</title>
+    <meta charset="utf-8"/>
+    <link rel="stylesheet" type="text/css" href="style.css"/>
+  </head>
+  <body>
+    <iframe id="app" src="http://inapp-pay-test.paas.allizom.org"></iframe>
+  </body>
+</html>

gaia/dev_apps/in_app_pay_test/manifest.webapp

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+{
+  "name": "In-app Payment Tester",
+  "description": "Utility app to test in-app payments.",
+  "version": "1.0",
+  "launch_path": "/index.html",
+  "developer": {
+    "name": "The Gaia Team",
+    "url": "https://github.com/mozilla-b2g/gaia"
+  },
+  "default_locale": "en",
+  "icons": {
+    "84": "/style/icons/default_84.png",
+    "126": "/style/icons/default_126.png",
+    "142": "/style/icons/default_142.png",
+    "189": "/style/icons/default_189.png",
+    "284": "/style/icons/default_284.png"
+  }
+}

gaia/dev_apps/in_app_pay_test/style.css

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+#app {
+  position: fixed;
+  border: 0;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  width: 100%;
+  height: 100%;
+}