Update SkyDemo.apk to versionCode=2 for publishing to play store.

This version updates the url it loads from /home to /sky_home
and also adds a bit of logging on 404s.

TBR=abarth@chromium.org
BUG=

Review URL: https://codereview.chromium.org/1015243002

apk/demo/AndroidManifest.xml

@@ -4,7 +4,9 @@
      found in the LICENSE file.
  -->
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="org.domokit.sky.demo">
+    package="org.domokit.sky.demo"
+    android:versionCode="2"
+    android:versionName="0.0.1">
 
     <uses-sdk android:minSdkVersion="14" android:targetSdkVersion="21" />
     <uses-permission android:name="android.permission.INTERNET"/>