Roll versions in perparation for another APK release.

Also fixed roll_versions to no longer roll mojo paths
since those are not part of the sky_engine repository.

R=abarth@google.com

packages/flutter/CHANGELOG.md

+## 0.0.19
+
+  - 49 changes: https://github.com/domokit/mojo/compare/a64559a...1b8968c
+
 ## 0.0.18
 
   - 41 changes: https://github.com/domokit/mojo/compare/246e279...c3119f6

packages/flutter/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="18" android:versionName="0.0.18">
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.domokit.sky.demo" android:versionCode="19" android:versionName="0.0.19">
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" />
     <uses-permission android:name="android.permission.INTERNET" />

packages/flutter/example/demo_launcher/apk/release_notes/0.0.19.txt

+Fixed a common startup crasher on Android systems before 5.0
+Fixed to not draw behind the status bar on before Android 5.0
+First release from new http://github.com/domokit/sky_engine repository.
+
+I suspect there may still be some crashes we will be fixing
+in the coming days as we set up systems to catch these crashes
+before they are shipped to users.

packages/flutter/pubspec.yaml

@@ -11,4 +11,4 @@ environment:
   sdk: '>=1.8.0 <2.0.0'
 homepage: https://github.com/domokit/mojo/tree/master/sky
 name: sky
-version: 0.0.18
+version: 0.0.19