Merge pull request #4 from rouffj/master

[RFR] Add Mail component
Update README
[Mail] move isset/getter to bottom of Mail
[Mail] Change icebox order
Integrate swiftmailer
[Mail] add Usage section
[Mail] Refactoring + force contentType/charset
[Mail] mark 2nd US as done
Merge pull request #5 from ddd-php/swiftmailer-inte

[RFR][Mail] As a user, I should be able to send basic `TextMail` with SwiftMailer as `MailerInterface` implementation
[Mail] Finish AmazonSES integration
[Mail] Fix commented out code
Merge pull request #6 from ddd-php/amazonSES-inte

[RFR][Mail] Finish AmazonSES integration
[Mail] Now Mail entity have now a fluent interface
[Mail] Finish MailerBuilder US
[Mail] update README
[Mail] re-organize README
Update README
Merge pull request #7 from ddd-php/mail-builder

[RFR] I should be able to create a mail without knowing any domain object
Change builder recipients adding
Fix code style