mail-madmimi gem first version

Summary:
Ruby Gem for integrating MadMimi with ActionMailer (Rails 4)
Since we had a one, but it's old and doesn't track mimi's exceptions

Fix settings bug

Fix gemspec

Version fix

Move for correct place

Fix settings

Revisando gemspec

Updating gemspec

Fixing version

Forces integration with action mailer

update required paths

Fix gemspec name

Gemfile.lock

Fixing paths

Names

Basic tests

Renaming methods

More tests

read-me

New docs

Finishing tests

Readme and travis

Test Plan:
Execute rspec spec/
All tests should pass.

If you have a mimi account you may create a mailer and test it with rails.

Reviewers: rnavarro, guimello, andre, mpelos

Reviewed By: guimello

CC: miguel.akira, fabiolima, cassiano

Differential Revision: http://phabricator.tagview.com.br/D286