Fixing an issue with embedded images

Fixed the issue with html parsing when there was an embedded base64
encoded image in the source - which resulted in regexp errors (too long
regexp).
changed white spaces
Merge pull request #319 from gergoe/master

Fixing an issue with embedded images
Update class.smtp.php

Not all SMTP servers will provide a value for SIZE. This commit checks to be certain there is an element in the array before attempting to access it.
Update class.smtp.php

Set the value to 0 if the fields array is empty
Merge pull request #320 from hemmerich/patch-1

Update class.smtp.php
Merge branch 'master' of https://github.com/PHPMailer/PHPMailer