Updated EmailAddress with new type (to, cc & bcc)

Also removed now redundant SendMessage methods that was using old SMTP
header hack

More info,
http://blog.mandrill.com/rules-options-easier-bcc.html
Added support for images for inbound WebHooks
Merge pull request #39 from mhallin79/mhallin

Updated EmailAddress with new type (to, cc & bcc)