Remove POD used for Pod::Readme automatic README generator.
I wrote the README by hand and no longer need these directives.
Update the style in WWW::AUR::Login and hard-code the upload file and type.

The filename and mimetype are ignored by the AUR so we provide a dummy
value. Otherwise LWP tries to auto-detect the values anyways.
Adds example for uploading files to AUR.

This script will be useful for testing uploads I hope.