[Rails] Provide a wrapper method for Rails.root/RAILS_ROOT that avoids deprecation warnings and handles the case where rails is not loaded at all.

lib/compass/app_integration/rails.rb

@@ -26,6 +26,14 @@ module Compass
         end
       end
 
+      def root
+        if defined?(::Rails)
+          ::Rails.root
+        elsif defined?(RAILS_ROOT)
+          RAILS_ROOT
+        end
+      end
+
     end
   end
 end

lib/compass/app_integration/rails/installer.rb

@@ -94,7 +94,7 @@ NEXTSTEPS
           "# 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"
+              "project_path = Compass::AppIntegration::Rails.root\n"
             elsif prop == :environment
               "environment = Compass::AppIntegration::Rails.env\n"
             elsif prop == :output_style