Update sample templates for android-23 release

Converted "android-MNC" build target references (including
min/compile) to use "23" instead, to correspond with
recent SDK builds.

Includes source file refresh.

Change-Id: I441aba7b50d16179cc231531e6aeffd108cdd404
diff --git a/content/AutoBackupForApps/template-params.xml b/content/AutoBackupForApps/template-params.xml
index fedbf66..48cd735 100644
--- a/content/AutoBackupForApps/template-params.xml
+++ b/content/AutoBackupForApps/template-params.xml
@@ -20,9 +20,7 @@
     <group>Content</group>
     <package>com.example.android.autobackup</package>
 
-    <minSdk>"MNC"</minSdk>
-    <targetSdk>"MNC"</targetSdk>
-    <compileSdkVersion>"android-MNC"</compileSdkVersion>
+    <minSdk>23</minSdk>
 
     <strings>
         <intro>