Add release signingConfig and use local.properties as source

Ghost User
2017-10-25T18:41:48+02:00

This add a simple release signingConfig to make releasing a breeze. How To Use --- Make sure you have a keystore somewhere and you know the password, key alias and key alias password. Now create and/or open the `local.properties` file in the `/android` folder. Add the following parameters to the file: ``` RELEASE_STORE_FILE= RELEASE_KEY_ALIAS= ``` And you will now be able to run `./gradlew assembleRelease` inside the `android` folder to compile a release-ready packaged APK. The store password will popup as input modal. *In case the build doesn't include the `index.bundle.js`: make sure the `org.gradle.configureondemand` parameter in `~/.gradle/gradle.properties` equals `false`.*