Upgrade Gemfile for Rails 4
Upgrade boot.rb for Rails 4
Config environments for Rails 4
Remove whitelist_attributes of application config
Change old syntax of routes
Add filter_parameter_logging.rb
Remove acessibles from model Post
Remove acessibles from model User
Add permit params for PostsController
Config spec_helper
Put gem versions on Gemfile
Add use transactional fixtures true on spec helper
Update deferred garbage collection for rails 4
Change .rvmrc to .ruby-version and ruby-gemset