[AWS] Patch suggestion for AWS.MIME (patch files attached)

[Emmanuel Briot]

> With the attached patch, users can do:
> 
>     AWS.MIME.Load (MIME_File => "/path/to/mime.file");

Seems like a good idea, I agree.
In the past, I have hard-coded new MIME types directly in AWS, but that's not a
luxury available to most users :-)

Emmanuel