Add indent for multiline server replies

Add indent for multiline server replies when printing debug log to console.
Merge pull request #262 from AnrDaemon/patch-1

Add indent for multiline server replies
Support images with data: uri's in HTML message
Make edebug behave the same way in PHPMailer and SMTP classes - always output in UTF-8, see #263
Allow injection of a user-defined debug output method, fixes #260
Merge branch 'master' of https://github.com/PHPMailer/PHPMailer
Merge pull request #264 from EionRobb/patch-1

Support images with data: uri's in HTML message
Cleanup