Emailqueue v3.1

Now Emailqueue supports attached files, finally!

It also supports auto-conversion of images found on emails to attached embedded files, so emails are sent completely self-contained, without the need to establish a connection to download images. (Some email clients might even show images straightaway, without asking the user to click to download them).

Lots of minor bugs solved, and code has been improved.

Frontend visually improved.

Added support for non-standard SMTP ports. (Perfect for external SMTPs like elasticemail.com)

PHPMailer is now part of emailqueue as a git submodule, so your PHPMailer will be always up-to-date along Emailqueue.

Much better documentation. <note_to_self>Now it almost looks as a professional open source project.</note_to_self>