Added devise to Gemfile
Added default_url_options to development.rb
Added notice and alert to application.html.erb
Generated bin/rails generate devise:views
Generated devise User model
Generated db migration unchanged
Added before_action :authenticate_user! to posts controller
Added some redirections after sign in and sign out
Changed title for welcome page
Added conditional devise notice and alert
Added logout link
Added some file to ignore
Added style 100% width to input form
Added style for error fill in forms
Added partials to clean up duplication in views
Added User helper to include display custom sign_in and sign-up form anywhere in this app
Added to .gitignore file *.template to ignore