Installs database cleaner

- preparation for feature tests with capybara
see:
http://devblog.avdi.org/2012/08/31/configuring-database_cleaner-with-rails-rspec-capybara-and-selenium/

spec/spec_helper.rb

@@ -6,7 +6,6 @@ require File.expand_path('../../config/environment', __FILE__)
 
 if Rails.configuration.database_configuration['test']['database'] == ':memory:'
   load "#{Rails.root}/db/schema.rb"
-  load "#{Rails.root}/db/seeds.rb"
 end
 
 require 'rspec/rails'
@@ -35,7 +34,7 @@ RSpec.configure do |config|
   # If you're not using ActiveRecord, or you'd prefer not to run each of your
   # examples within a transaction, remove the following line or assign false
   # instead of true.
-  config.use_transactional_fixtures = true
+  config.use_transactional_fixtures = false
 
   # Run specs in random order to surface order dependencies. If you find an
   # order dependency and want to debug it, you can fix the order by providing

spec/support/database_cleaner.rb

@@ -0,0 +1,22 @@
+RSpec.configure do |config|
+
+  config.before(:suite) do
+    DatabaseCleaner.clean_with(:truncation)
+  end
+
+  config.before(:each) do
+    DatabaseCleaner.strategy = :transaction
+  end
+
+  config.before(:each, :js => true) do
+    DatabaseCleaner.strategy = :truncation
+  end
+
+  config.before(:each) do
+    DatabaseCleaner.start
+  end
+
+  config.after(:each) do
+    DatabaseCleaner.clean
+  end
+end