Update class.phpmailer.php

If MessageDate was not explicitely set before composing message, we get empty value if we need to retrieve date late (i.e. for debug or log purposes).
Merge pull request #227 from SDKiller/master

Update class.phpmailer.php
Remove typo
More robust handling of pattern selection value in validateAddress, fixes #226
Fix HTML5 email validation
Merge branch 'master' of https://github.com/PHPMailer/PHPMailer