Getting the following when calling create in the following way:

```
undefined method `each' for nil:NilClass
/Users/natwelch/Projects/fog/lib/fog/google/models/compute/server.rb:35:in `block in public_ip_address'
/Users/natwelch/Projects/fog/lib/fog/google/models/compute/server.rb:34:in `each'
/Users/natwelch/Projects/fog/lib/fog/google/models/compute/server.rb:34:in `public_ip_address'
/Users/natwelch/Projects/fog/lib/fog/compute/models/server.rb:71:in `sshable?'
```

```ruby
    server = connection.servers.create(defaults = { 
      :name => "fog-smoke-test-#{Time.now.to_i}",
      :image_name => "debian-7-wheezy-v20130522",
      :machine_type => "n1-standard-1",
      :zone_name => "us-central1-a",
      :private_key_path => File.expand_path("~/.ssh/id_rsa"),
      :public_key_path => File.expand_path("~/.ssh/id_rsa.pub"),
      :external_ip => false,
      :user => ENV['USER'],
    })  
until server.sshable?
puts "."
end
```