Honor pod =encoding and test with utf8-character-string stopwords

This attempts to address https://rt.cpan.org/Ticket/Display.html?id=83328

The first change (rwstauner@09de1ec) worked in a limited capacity but was a silly hack.

The second change (rwstauner@ce1c8a8) is still a silly hack but may actually be sufficient.

It will now find an `=encoding` pod command,
decode the pod, and do the remaining processing as utf-8.

This way if stopwords are added that have the utf-8 flag on, they work.

What do you think about this?