Topic 478

Implements Issue #478 - Also adds a "TLS" encryption option to mail SMTP server settings in addition to allowing the use of self-signed mail server certificates.  Updated SwiftMailer to latest and greatest version with a minor update to allow for the passing of self-signed certificate "options" from yii-mail.  See StackOverflow reference here:
http://stackoverflow.com/questions/26896265/php-swiftmailer-using-starttls-and-self-signed-certificates

I will be submitting a pull request to swiftmailer with this update as well as trying to contact the yii-mail author to include this addition.