Images in order receipt is not fully qualified, and is not shown in the email

[evest]

When sending the order receipt we add a footer and header text from the Email Notification page. This text can have images.

The receipt should also have the product image in it (which it currently does not.)

When sending the email, all image urls are relative, which won't work in email markup. No images will be shown.

We use the Premailer.Net package to move styles inline, and it also has support for adding a base url to all links. We need to update this package to the latest version. Problem is, the Newsletter module also uses it, and breaks with v1.3 or newer, so that one needs to be fixed first.