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/tests/jsmarionette/runner/mozilla-profile-builder/lib/options/prefs.js

@@ -0,0 +1,32 @@
+'use strict';
+var fs = require('fs'),
+    fsPath = require('path'),
+    pref = require('../pref');
+
+var USER_PREF = 'user.js';
+/**
+ * Appends prefs to the given profile.
+ *
+ * Options:
+ *  - (Object) prefs: key/value pairs.
+ *
+ * @param {String} profile path to profile.
+ * @param {Object} options for prefs.
+ * @param {Function} callback fires after successfully saving.
+ */
+function appendPrefs(profile, options, callback) {
+  // we userPrefs was used in the past
+  var prefsConfig = options.prefs || options.userPrefs;
+  // don't do anything unless there are some new prefs
+  if (!prefsConfig || Object.keys(prefsConfig).length === 0) {
+    return process.nextTick(callback.bind(null, null, profile));
+  }
+
+  var filename = fsPath.join(profile, USER_PREF);
+  fs.appendFile(filename, '\n' + pref(prefsConfig), function(err) {
+    if (err) return callback(err);
+    callback(null, profile);
+  });
+}
+
+module.exports = appendPrefs;