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/taskcluster/tasks/build_unit.yml

@@ -0,0 +1,31 @@
+reruns: 2
+task:
+  metadata:
+    name: Gaia build tests
+    description: Runs entire gaia build system through all known variants.
+
+  workerType: '{{workerType}}'
+  provisionerId: '{{provisionerId}}'
+  scopes:
+    # Source caches contains various sources (including a tarball of gaia source
+    # tree)
+    - docker-worker:cache:gaia-misc-caches
+
+  payload:
+    cache:
+      gaia-misc-caches: /home/worker/caches/
+
+    env:
+      REPORTER: 'mocha-tbpl-reporter'
+      DEBUG: '*'
+      NODE_MODULES_SRC: npm-cache
+
+    command:
+      - entrypoint
+      - ./bin/ci run build_unit
+
+  extra:
+    treeherder:
+      groupSymbol: GB
+      groupName: "Gaia build tests"
+      symbol: GBU