rails/rails — pull request #8427 by kennyj (2012-12-05 17:12:23+00:00)
Title: Add ENV['RACK_ENV'] support to rake runner/console/server.

`rake dbconsole` support ENV['RACK_ENV']. And `railties/lib/rails.rb` also support one.

```ruby
87 def env
88 @_env ||= begin
89 ENV["RAILS_ENV"] ||= ENV["RACK_ENV"] || "development"
90 ActiveSupport::StringInquirer.new(ENV["RAILS_ENV"])
91 end
92 end
```

I thinks we should use RACK_ENV for usefulness and consistency.