Use simplecov for C0 coverage

* Include simplecov gem in Gemfile, test group
* Insert simplecov init into spec_helper.rb, env.rb

lib/suspenders/app_builder.rb

@@ -2,6 +2,8 @@ module Suspenders
   class AppBuilder < Rails::AppBuilder
     include Suspenders::Actions
 
+    SIMPLECOV_INIT = %{require 'simplecov'\nSimpleCov.start 'rails'\n\n}
+
     def readme
       template 'README.md.erb', 'README.md'
     end
@@ -136,6 +138,7 @@ def configure_action_mailer
     def generate_rspec
       generate 'rspec:install'
       inject_into_file '.rspec', " --drb", :after => '--color'
+      prepend_file 'spec/spec_helper.rb', SIMPLECOV_INIT
       replace_in_file 'spec/spec_helper.rb',
         '# config.mock_with :mocha', 'config.mock_with :mocha'
     end
@@ -146,6 +149,21 @@ def configure_capybara_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/
+      end
+    end
+
     def setup_guard_spork
       copy_file 'Guardfile', 'Guardfile'
     end

templates/Gemfile_additions

@@ -25,6 +25,7 @@ group :test do
   gem 'timecop'
   gem 'shoulda-matchers'
   gem 'launchy'
+  gem 'simplecov', require: false
 end
 
 group :staging, :production do