Updated express app to include Firebase token generators
Updated express app to include Firebase token generators

chrisjmendez/swift-exercises,chrisjmendez/swift-exercises,chrisjmendez/swift-exercises,chrisjmendez/swift-exercises,chrisjmendez/swift-exercises,chrisjmendez/swift-exercises,chrisjmendez/swift-exercises,chrisjmendez/swift-exercises