Updated package version in Android samples

samples/android/15-puzzle/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.puzzle15"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/color-blob-detection/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.opencv.example.colorblobdetect"
-    android:versionCode="1"
-    android:versionName="1.0" >
+    android:versionCode="21"
+    android:versionName="2.1" >
 
     <uses-sdk android:minSdkVersion="8" />
 

samples/android/face-detection/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.fd"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/image-manipulations/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.imagemanipulations"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/tutorial-0-androidcamera/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.tutorial0"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/tutorial-1-addopencv/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.tutorial1"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/tutorial-2-opencvcamera/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.tutorial2"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/tutorial-3-native/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.tutorial3"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"

samples/android/tutorial-4-mixed/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
       package="org.opencv.samples.tutorial4"
-      android:versionCode="1"
-      android:versionName="1.0">
+      android:versionCode="21"
+      android:versionName="2.1">
 
     <supports-screens android:resizeable="true"
                       android:smallScreens="true"