support for android test release builds, fixed #1154

package.json

   "scripts": {
     "build": ":",
     "xcode": "open playground/ios/playground.xcodeproj",
-    "install-android": "cd playground/android && ./gradlew installDebug",
+    "install-android": "node ./scripts/install-android.js",
     "uninstall-android": "cd playground/android && ./gradlew uninstallAll",
     "clean": "node ./scripts/clean.js",
     "start": "node ./scripts/start.js",

playground/android/app/build.gradle

 apply plugin: "com.android.application"
+
+project.ext.react = [
+        root     : "../../../",
+        entryFile: "playground/index.android.js"
+]
+
 apply from: "../../../node_modules/react-native/react.gradle"
 
 android {
         versionCode 1
         versionName "1.0"
     }
+    signingConfigs {
+        release {
+            storeFile file('../playground.jks')
+            storePassword "playground"
+            keyAlias "playground"
+            keyPassword "playground"
+        }
+    }
+    buildTypes {
+        release {
+            signingConfig signingConfigs.release
+        }
+    }
 }
 
 dependencies {

scripts/install-android.js

+const _ = require('lodash');
+const exec = require('shell-utils').exec;
+
+const release = _.includes(process.argv, 'release');
+
+run();
+
+function run() {
+  exec.execSync(`cd playground/android && ./gradlew ${release ? 'installRelease' : 'installDebug'}`);
+}

scripts/test.e2e.android.js

   }
 
   exec.execSync(`yarn run uninstall-android`);
-  exec.execSync(`yarn run install-android`);
+  exec.execSync(`yarn run install-android ${release ? '-- release' : ''}`);
   exec.execSync(`cd AndroidE2E && ./gradlew connectedDebugAndroidTest`);
 }