Treat headers as case-insensitive so duplicate headers are not a prob…

…lem (mailgun#158)

* Treat headers as case-insensitive so duplicate headers are not a problem

* Bump bundler and rake versions

* Loose version for bundler

* Ignore `reply-to` set in headers

Add Railgun docs, tests, and support ActionMailer headers call (mailg…

…un#133)

* Add Railgun docs, tests, and support ActionMailer headers call

* Upgrade gems and prep for release

Version bump to 1.1.10 (mailgun#147)

Bump version for mailgun#134 (mailgun#137)

Bump version (mailgun#123)

Suppressions, Events, bugfixes omnibus (mailgun#98)

* Suppressions docs, code doc updates, small bugfixes with suppression client

* Other miscellaneous improvements

1.1.5 (2017-02-27)

- Fixed attachments in Railgun.

Do not allow send_message to be passed nils in data hash (mailgun#32) (…

…mailgun#70)

- Fixed some incorrect links in the readme

- Document the module name to require in the readme
- Fixed `Reply-To` having extra characters added to it
- Removed leading newline from MIME string
- Initial implementation of suppressions management
- Implement Railgun, an ActiveMailer interface for Mailgun
- Removed a broken dependency for Faker that was added to the suppressions spec

mailgun-ruby release 1.1.2 - cut 2016-11-11

Minor release - includes:
  - More informative error messages (mailgun#65)
  - Client-side test mode for preventing accidental mail send (mailgun#66)