Preload application classes. Uses same strategy as phusion passenger.

railties/lib/initializer.rb

@@ -168,6 +168,9 @@ def process
      # Observers are loaded after plugins in case Observers or observed models are modified by plugins.
      load_observers

      # load application classes
      load_application_classes

      # Flag initialized
      Rails.initialized = true
    end
@@ -330,6 +333,14 @@ def load_observers
      end
    end

    def load_application_classes
      require_dependency 'application'

      Dir.glob('app/{models,controllers,helpers}/*.rb').each do |file|
        require_dependency file
      end
    end

    # For Ruby 1.8, this initialization sets $KCODE to 'u' to enable the
    # multibyte safe operations. Plugin authors supporting other encodings
    # should override this behaviour and set the relevant +default_charset+