Added support for mailgun templates

[gps-lasrol]

Added support to use Mailgun templates the same way you can use Sendgrid templates.

[gps-lasrol]

Related to issue #372

[Ruitjes]

Can this PR be approved, also need to use the MailGun Templates

[JohnCampionJr]

I'm adding this to my fork if you're interested: https://github.com/jcamp-code/FluentEmail

[Ronnehag]

I'm also in need of this, would be great if it could be approved.

[JohnCampionJr]

Again, this is already in my fork: https://github.com/jcamp-code/FluentEmail

[kondason]

any update on this? when can you push the changes so we can update our library? thanks!

[JohnCampionJr]

any update on this? when can you push the changes so we can update our library? thanks!

Not sure why people don't read the thread - this is already in my fork: https://github.com/jcamp-code/FluentEmail