Fix script/server to use the environment given by the -e toggle

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2552 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/commands/server.rb

@@ -47,6 +47,8 @@ ARGV.options do |opts|
 end
 
 ENV["RAILS_ENV"] = OPTIONS[:environment]
+RAILS_ENV.replace(OPTIONS[:environment]) if defined?(RAILS_ENV)
+
 require RAILS_ROOT + "/config/environment"
 require 'webrick_server'