Minimal changes to configs from http://edgeguides.rubyonrails.org/upgrading_ruby_on_rails.html.
Leaving a lot of gems commented out in Gemfile to see which are still necessary.
Converted class_inheritable_accessor to class_accessor.
Switched to acts_as_versioned_jw.
Restored several gems, removed Gemfile.lock from versioning.
Unset I18n.enforce_available_locales to silence deprecation warning.
enum_column3 is necessary after all
Renamed all view templates from rhtml to html.erb
Two references to old rhtml files in code.
ActiveRecord#errors no longer has the method errors.length.
It is now called errors.size.
Had to convince name/eol to use correct template.
Had to convince observer/rss to use the correct template.