Upgrade gradle

app/build.gradle

@@ -1,12 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 19
+    compileSdkVersion 21
     buildToolsVersion "21.1.1"
 
     defaultConfig {
+        applicationId "me.storm.ninegag"
         minSdkVersion 14
-        targetSdkVersion 19
+        targetSdkVersion 21
         versionCode 4
         versionName "1.3"
     }
@@ -24,7 +25,7 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar', '*.aar'])
-    compile 'com.android.support:support-v4:19.1.+'
+    compile 'com.android.support:support-v4:21.0.2'
 
     // AndroidStaggeredGrid https://github.com/etsy/AndroidStaggeredGrid
     compile 'com.etsy.android.grid:library:1.0.5'