Rewrite of Remote Smart Card Reader

- use material design
- use AsyncTask instead of Runnable for VPCDWorker to integrate with the
  App's lifecycle
- use a dedicated Preference Activity
- integrated zxing's QR code scanner
- use Snackbar instead of Toast
- capture debug messages in log instead of explicitly passing messages
- use reader mode only, breaks support of Android before kitkat

remote-reader/app/build.gradle

@@ -5,22 +5,33 @@ android {
     buildToolsVersion "23.0.1"
 
     defaultConfig {
-        applicationId "com.vsmartcard.remotesmartcardreader"
-        minSdkVersion 10
+        applicationId "com.vsmartcard.remotesmartcardreader.app"
+        // NFC reader mode was added in KitKat
+        minSdkVersion 19
         targetSdkVersion 23
-        versionCode 3
-        versionName "1.2"
+        versionCode 4
+        versionName "2.0"
     }
+
     buildTypes {
         release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
 }
 
+repositories {
+    mavenCentral()
+}
+
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:appcompat-v7:23.0.1'
-    compile 'com.android.support:support-v4:23.0.1'
+    testCompile 'junit:junit:4.12'
+    compile 'com.android.support:appcompat-v7:23.2.1'
+    compile 'com.android.support:design:23.2.1'
+    compile 'com.android.support:support-v4:23.2.1'
+
+    compile 'com.journeyapps:zxing-android-embedded:3.2.0@aar'
+    compile 'com.google.zxing:core:3.2.1'
 }