renaming factory girl => factory bot

spec/factories/server_factory.rb

@@ -39,13 +39,13 @@
 #  index_servers_on_uuid             (uuid)
 #
 
-FactoryGirl.define do
+FactoryBot.define do
 
   factory :server do
     association :organization
-    name "Mail Server"
-    mode "Live"
-    provision_database false
+    name { "Mail Server" }
+    mode { "Live" }
+    provision_database { false }
     sequence(:permalink) { |n| "server#{n}" }
   end