title: In new Firebase, how to use multiple config file in xcode?
body: <p>Hey I am playing with the new firebase iOS SDK, in my project, I have only one target, I created two configurations, Debug and Release, with different bundler identifier， but seems like the config file downloaded from firebase only support one bundle identifier.</p>
  
  <p>So anyone know how to use firebase within a multiple bundle identifier xcode project?</p>
  
  <p>Thanks!</p>