remove outdated config option. default to generated secret key

rails always runs initializers now. raising on heroku means that asset
compilation fails since asset compilation doesn't have access to env
variables :(

template.rb

@@ -95,10 +95,6 @@ def git_email
 run 'bundle exec guard init rspec'
 
 
-# for deployment to heroku
-application 'config.assets.initialize_on_precompile = false'
-
-
 # enable simple factory girl syntax (create, build) in rspec and cucumber
 create_file 'spec/support/factory_girl.rb', <<-CODE
 RSpec.configure do |config|
@@ -178,13 +174,7 @@ def git_email
 # require css assets explicitly instead of `require_tree`
 gsub_file 'app/assets/stylesheets/application.css', /require_tree \.$/, 'require screen'
 
-gsub_file 'config/initializers/secret_token.rb', /= '.*?'/, "= ENV['SECRET_TOKEN'] || Rails.env"
-append_to_file 'config/initializers/secret_token.rb', <<-CODE
-
-if Rails.env.production? && ENV['SECRET_TOKEN'].blank?
-  raise "Please specify a secret token, e.g.: SECRET_TOKEN=\#{SecureRandom.hex(20)}"
-end
-CODE
+gsub_file 'config/initializers/secret_token.rb', /= '.*?'/, %(= ENV['SECRET_TOKEN'] || "#{SecureRandom.hex(20)}")
 
 insert_into_file 'app/helpers/application_helper.rb', after: 'module ApplicationHelper\n' do
 <<-CODE