Fix problem with RAILS_ENV being frozen when set from environment variable

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@2576 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

railties/lib/commands/runner.rb

@@ -1,6 +1,6 @@
 require 'optparse'
 
-options = { :environment => "development" }
+options = { :environment => (ENV['RAILS_ENV'] || "development").dup }
 
 ARGV.options do |opts|
   script_name = File.basename($0)

railties/lib/commands/server.rb

@@ -4,7 +4,7 @@ require 'optparse'
 OPTIONS = {
   :port            => 3000,
   :ip              => "0.0.0.0",
-  :environment     => "development",
+  :environment     => (ENV['RAILS_ENV'] || "development").dup,
   :server_root     => File.expand_path(RAILS_ROOT + "/public/"),
   :server_type     => WEBrick::SimpleServer,
   :charset         => "UTF-8",

railties/lib/initializer.rb

@@ -1,6 +1,6 @@
 require 'logger'
 
-RAILS_ENV = ENV['RAILS_ENV'] || 'development' unless defined?(RAILS_ENV)
+RAILS_ENV = (ENV['RAILS_ENV'] || 'development').dup unless defined?(RAILS_ENV)
 
 module Rails
   # The Initializer is responsible for processing the Rails configuration, such as setting the $LOAD_PATH, requiring the