Fix exceptions raised/rescued in dev by IPAddr

Putting ".localhost" at the end causes 4 IPAddr::InvalidAddressError
exceptions to be raised and rescued during every request when the
HostAuthorization middleware attempts to compare an IPAddr with a
"localhost" string.

railties/lib/rails/application/configuration.rb

@@ -33,7 +33,7 @@ def initialize(*)
         @filter_parameters                       = []
         @filter_redirect                         = []
         @helpers_paths                           = []
-        @hosts                                   = Array(([IPAddr.new("0.0.0.0/0"), IPAddr.new("::/0"), ".localhost"] if Rails.env.development?))
+        @hosts                                   = Array(([".localhost", IPAddr.new("0.0.0.0/0"), IPAddr.new("::/0")] if Rails.env.development?))
         @public_file_server                      = ActiveSupport::OrderedOptions.new
         @public_file_server.enabled              = true
         @public_file_server.index_name           = "index"