Add Android release configuration
Add Android release configuration

Steps documented here: https://facebook.github.io/react-native/docs/signed-apk-android.html#generating-signed-apk

grunskis/senic-hub,grunskis/senic-hub,grunskis/senic-hub,grunskis/nuimo-hub-backend,grunskis/nuimo-hub-backend,grunskis/nuimo-hub-backend,grunskis/nuimo-hub-backend,getsenic/senic-hub,grunskis/nuimo-hub-backend,grunskis/senic-hub,getsenic/senic-hub,grunskis/senic-hub,grunskis/senic-hub