[Rails] Fix a setup bug and handle compass configuration changes at rails boot.

Existing rails projects should change their compass initializer file to:

    require 'compass'
    rails_root = (defined?(Rails) ? Rails.root : RAILS_ROOT).to_s
    Compass.add_project_configuration(File.join(rails_root, "config", "compass.rb"))
    Compass.configure_sass_plugin!
    Compass.handle_configuration_change!

lib/compass/app_integration/rails.rb

@@ -20,6 +20,12 @@ module Compass
           extend(ConfigurationDefaults)
       end
 
+      def env
+        if rails_env = (defined?(::Rails) ? ::Rails.env : (defined?(RAILS_ENV) ? RAILS_ENV : nil))
+          rails_env.production? ? :production : :development
+        end
+      end
+
     end
   end
 end

lib/compass/app_integration/rails/installer.rb

@@ -80,9 +80,12 @@ module Compass
         end
 
         def config_contents
+          "# This configuration file works with both the Compass command line tool and within Rails.\n" +
           Compass.configuration.serialize do |prop, value|
             if prop == :project_path
               "project_path = RAILS_ROOT if defined?(RAILS_ROOT)\n"
+            elsif prop == :environment
+              "environment = Compass::AppIntegration::Rails.env\n"
             elsif prop == :output_style
               ""
             end
@@ -91,11 +94,11 @@ module Compass
 
         def initializer_contents
           %Q{require 'compass'
-  # If you have any compass plugins, require them here.
-  Compass.configuration.parse(File.join(RAILS_ROOT, "config", "compass.rb"))
-  Compass.configuration.environment = (defined?(Rails) ? Rails.env : RAILS_ENV).to_sym
-  Compass.configure_sass_plugin!
-  }
+            |rails_root = (defined?(Rails) ? Rails.root : RAILS_ROOT).to_s
+            |Compass.add_project_configuration(File.join(rails_root, "config", "compass.rb"))
+            |Compass.configure_sass_plugin!
+            |Compass.handle_configuration_change!
+            |}.gsub(/^\s+\|/,'')
         end
 
         def stylesheet_prefix

lib/compass/configuration/inheritance.rb

@@ -145,13 +145,17 @@ module Compass
           end
         end
 
-        def debug
+        def chain
           instances = [self]
           instances << instances.last.inherited_data while instances.last.inherited_data
+          instances
+        end
+
+        def debug
           normalized_attrs = {}
           ATTRIBUTES.each do |prop|
             values = []
-            instances.each do |instance|
+            chain.each do |instance|
               values << {
                 :raw => (instance.send("raw_#{prop}") rescue nil),
                 :value => (instance.send("#{prop}_without_default") rescue nil),