Remove remaining references to Cucumber

* Use the defined step to rake cleanly.
* Remove leading spaces before JS driver. It causes inconsistent
  formatting.

features/rake_clean.feature

@@ -4,17 +4,13 @@ Feature: Rake works in the suspended project
   Scenario: Running rake in the suspended project
     When I suspend a project called "test_project"
     And I cd to the "test_project" root
-    When I drop and create the required databases
-    And I run the rake task "db:create"
-    And I run the rake task "db:migrate"
-    And I run the rake task "db:test:prepare"
-    And I run rake
-    Then I see a successful response in the shell
+    And I drop and create the required databases
+    Then I can cleanly rake the project
 
   Scenario: Making a spec then running rake
-    When I drop and create the required databases
-    And I suspend a project called "test_project"
+    When I suspend a project called "test_project"
     And I generate "model post title:string"
+    And I drop and create the required databases
     And I run the rake task "db:migrate"
     And I run the rake task "db:test:prepare"
     And I run the rake task "spec"

features/step_definitions/suspenders_steps.rb

@@ -55,7 +55,7 @@
     And I run the rake task "db:create"
     And I run the rake task "db:migrate"
     And I run the rake task "db:test:prepare"
-    And I run the rake task "cucumber"
+    And I run rake
     Then I see a successful response in the shell
   }
 end

lib/suspenders/app_builder.rb

@@ -150,24 +150,7 @@ def generate_rspec
 
     def configure_capybara_webkit
       append_file 'spec/spec_helper.rb' do
-        "\n  Capybara.javascript_driver = :webkit"
-      end
-    end
-
-    def generate_cucumber(options = {})
-      generate 'cucumber:install', '--rspec', '--capybara'
-      inject_into_file 'config/cucumber.yml',
-        ' -drb -r features',
-        :after => %{default: <%= std_opts %> features}
-      copy_file 'features_support_env.rb',
-        'features/support/env.rb',
-        :force => true
-      prepend_file 'features/support/env.rb', simplecov_init
-
-      if options[:webkit]
-        inject_into_file 'features/support/env.rb',
-          "\n  Capybara.javascript_driver = :webkit",
-          :after => /Capybara.default_selector = :css/
+        "\nCapybara.javascript_driver = :webkit"
       end
     end