Upgrade the underlying NFD to version 0.5.0

Change-Id: I61eb240cb982eb5e675a63aece0c373290c59129
Refs: #3839
diff --git a/app/build.gradle b/app/build.gradle
index 374c9d5..cf11041 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,8 +10,8 @@
         applicationId "net.named_data.nfd"
         minSdkVersion 15
         targetSdkVersion 19
-        versionCode 4001
-        versionName "0.2.1 (NFD 0.4.0-3-g4100646)"
+        versionCode 4002
+        versionName "0.2.2 (NFD 0.5.0)"
     }
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_7