add 'faker' gem to development environment
remove 'rails_mailinglist_signup' example app from menu pending release of Rails 4.2
specify no analytics for 'learn-rails' example app
see CHANGELOG, bump version to 3.0.12
see CHANGELOG, bump version to 3.0.13
use role-based authorization for 'rails-signup-download' app
accommodate Devise for Rails 4.2.0.beta1
update references to Bootstrap and Foundation versions
see CHANGELOG, bump version to 3.0.15
add Upmin option for an admin interface
Upmin option only for Devise
fix for Procfile create/update: newline added to the end of content
Merge pull request #318 from Gera-IT/master

fix for Procfile create/update: newline added to the end of content
see CHANGELOG, bump version to 3.0.17
add Heroku option to 'deployment' recipe
see CHANGELOG, bump version to 3.0.18
accommodate new version of Figaro gem (closes #319)
improve generation of 'app.json' file for Heroku Button deployment
see CHANGELOG, bump version to 3.0.19
specify 'foundation-rails' gem version for https://github.com/zurb/foundation/issues/5811