Fix feature error with 3.0.12

Appraisals

-# appraise "3.0" do
-#   gem "rails", "~> 3.0.15"
-#   gem "paperclip", :path => "../"
-# end
+appraise "3.0" do
+  gem "rails", "~> 3.0.15"
+  gem "paperclip", :path => "../"
+end
 
 appraise "3.1" do
   gem "rails", "~> 3.1.6"

features/step_definitions/rails_steps.rb

@@ -3,6 +3,7 @@ Given /^I generate a new rails application$/ do
     When I run `bundle exec #{new_application_command} #{APP_NAME} --skip-bundle`
     And I cd to "#{APP_NAME}"
     And I turn off class caching
+    And I fix the application.rb for 3.0.12
     And I write to "Gemfile" with:
       """
       source "http://rubygems.org"
@@ -20,6 +21,14 @@ Given /^I generate a new rails application$/ do
   }
 end
 
+Given "I fix the application.rb for 3.0.12" do
+  in_current_dir do
+    File.open("config/application.rb", "a") do |f|
+      f << "ActionController::Base.config.relative_url_root = ''"
+    end
+  end
+end
+
 Given /^I run a rails generator to generate a "([^"]*)" scaffold with "([^"]*)"$/ do |model_name, attributes|
   step %[I successfully run `bundle exec #{generator_command} scaffold #{model_name} #{attributes}`]
 end