New port: mail/rubygem-premailer-rails

This gem brings you the power of the premailer gem to Rails
without any configuration needs. Create HTML emails, include
a CSS file as you do in a normal HTML document and premailer
will inline the included CSS.

WWW: https://github.com/fphilipe/premailer-rails

PR: 208508
Submitted by: Torsten Zuehlsdorff <ports@toco-domains.de>