Add android example release config

android/app/build.gradle

@@ -130,6 +130,7 @@ android {
         release {
             minifyEnabled enableProguardInReleaseBuilds
             proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
+            signingConfig signingConfigs.example
         }
     }
     // applicationVariants are e.g. debug, release

package.json

@@ -25,6 +25,7 @@
     "test": "eslint . && flow",
     "start": "node node_modules/react-native/local-cli/cli.js start",
     "run-android": "node node_modules/react-native/local-cli/cli.js run-android",
+    "release-android": "node node_modules/react-native/local-cli/cli.js run-android --variant=release",
     "log-android": "node node_modules/react-native/local-cli/cli.js log-android",
     "reload-android": "adb reverse tcp:8081 tcp:8081 && adb shell input text rr",
     "run-ios": "node node_modules/react-native/local-cli/cli.js run-ios"