* Give suggestions for why email preview may not be working ([#177])
* Add Mandrill template support ([#176])

* Build mailer config during runtime. Allows for configuratin with Conform ([#170])
* Fix "leaking" HTML email styles ([#172])
* Catch `nil` email addresses when used in 2-item tuple ([#151])
* Remove `ExMachina` from dev/prod deps. It should have been a test only dep ([#198])
* Small typo fixes ([#199])
* Explicitly set content type in email preview so that HTML emails are always preview as HTML ([#203] and [#204])

[#170]: https://github.com/thoughtbot/bamboo/pull/170
[#173]: https://github.com/thoughtbot/bamboo/pull/173
[#177]: https://github.com/thoughtbot/bamboo/pull/177
[#172]: https://github.com/thoughtbot/bamboo/pull/172
[#191]: https://github.com/thoughtbot/bamboo/pull/191
[#151]: https://github.com/thoughtbot/bamboo/pull/151
[#176]: https://github.com/thoughtbot/bamboo/pull/176
[#198]: https://github.com/thoughtbot/bamboo/pull/198
[#199]: https://github.com/thoughtbot/bamboo/pull/199
[#203]: https://github.com/thoughtbot/bamboo/pull/203
[#204]: https://github.com/thoughtbot/bamboo/pull/204