Fixes #25760 - audit incorrect links

Fixes #24245 - Audit new UX using reactjs

Fixes #23358 - Fix audit mails for template content

fixes #15847 - change mailer helpers from paths to URLs

Use of path helpers in mailers (with Roadie to rewrite to URLs) is
deprecated in Rails 4 and removed in Rails 5, so prefer URL helpers. To
replace URL rewriting and reduce duplication, default_url_options is now...

Fixes #8797 - Separate style from the HTML in emails

By using roadie-rails gem (1.1) style can be separated from email
html foramt, and absolute paths can be used.
style was separated to 'email.css'

Fixes #15047 - Improve audit email details

fixes #14006 - use URL helpers in mailers

Rails 4.2 deprecates mailers from using _path helpers and from path
helpers being called with only_path => false. They should all be
changed to use _url helpers.

fixes #1213 - Get email reports of audit changes