New framework defaults in Rails 5 to make upgrade easier

When a new version of Rails comes out, one of the pain points is upgrading existing apps to the latest version.

A Rails upgrade can be boiled down to following essential steps :

1. Have a green build
2. Update the Rails version in Gemfile and bundle
3. Run the update task to update configuration files
4. Run tests and sanity checks to see if anything is broken by the upgrade and fix the issues
5. Repeat step 4!