Add gemfile group for testing a production-like deployment

 * Add production_test gemfile group, to cover gems that are not strictly
   needed in production, but still required to test a production-like
   deployment; an example is 'faker', to seed the database with test data
 * Fix rubric rake task to avoid faker-ruby/faker#278 when run in a production
   environment

Gemfile

@@ -103,6 +103,13 @@ end
 # listed here
 group :development, :test do
   gem 'byebug', :platforms => [:mri_20, :mri_21]
+end
+
+# Gems needed (wanted) for development, test and production_test
+# can be listed here
+# production_test is for testing a production-like deployment,
+# but using a seeded database
+group :development, :test, :production_test do
   gem 'faker' # required for database seeding
 end
 

lib/tasks/rubric.rake

@@ -4,6 +4,7 @@ namespace :db do
   task :rubric => :environment do
     puts 'Add Rubric To Assignments'
     require 'faker'
+    I18n.reload!
 
     def pos_rand(range)
       rand(range) + 1