Roll to v16 for republishing with .sdkext support

BUG=
R=eseidel@chromium.org

Review URL: https://codereview.chromium.org/1231653002 .

sdk/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.0.16
+
+  - 27 changes: https://github.com/domokit/mojo/compare/e028733...e7433cf
+
 ## 0.0.15
 
   - 6 changes: https://github.com/domokit/mojo/compare/4df2d39...e028733

sdk/example/demo_launcher/apk/AndroidManifest.xml

@@ -3,7 +3,7 @@
      Use of this source code is governed by a BSD-style license that can be
      found in the LICENSE file.
  -->
-<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.domokit.sky.demo" android:versionCode="15" android:versionName="0.0.15">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.domokit.sky.demo" android:versionCode="16" android:versionName="0.0.16">
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" />
     <uses-permission android:name="android.permission.INTERNET" />

sdk/pubspec.yaml

@@ -7,4 +7,4 @@ dependencies:
 description: Dart files to support executing inside Sky.
 homepage: https://github.com/domokit/mojo/tree/master/sky
 name: sky
-version: 0.0.15
+version: 0.0.16

tools/big_red_button.py

@@ -1,8 +1,22 @@
-# Roll versions script:
-# /src/mojo/src/sky/apk/demo/AndroidManifest.xml version and string.
-# Update versions of pub packages:
-
-# Make a commit, upload it, land it.
+# Prepare release script.
+#
+# 1) Bump versions:
+# sky/sdk/example/demo_launcher/apk/AndroidManifest.xml
+# mojo/dart/mojo_services/pubspec.yaml
+# mojo/dart/mojom/pubspec.yaml
+# mojo/public/dart/pubspec.yaml
+# sky/sdk/pubspec.yaml
+#
+# 2) Update change logs:
+# mojo/dart/mojo_services/CHANGELOG.md
+# mojo/dart/mojom/CHANGELOG.md
+# mojo/public/dart/CHANGELOG.md
+# sky/sdk/CHANGELOG.md
+#
+# 3) Make a commit, upload it, land it.
+#
+# 4) Run this script.
+#
 
 # Useful links:
 # http://stackoverflow.com/questions/14665518/api-to-automatically-upload-apk-to-google-play