Bump Rails to 4.2
serve_static_assets was renamed to serve_static_files
Don't use AR internals (@attributes)
Enable Rails 5 behavior for exceptions in after_commit callbacks
ActionMailer deliver -> deliver_now
Use _url, not _path, in mailers
Don't pass a model instance where an id is expected
Bump activerecord-import
Don't use a too large invalid id
ActiveRecord::Base::reflection returns strings now
Don't split contact_ids when they already are an array
deliver needs to be called on the return value of the mailer call
Don't stub out id on nil
Rendering a file is no longer the default