Feature: Provided support for non-ascii character in public header

I love that we worked on this @MadisonRuby for #OSL
Force encoding of parsed filename

I love working at the #OSL
FIX: Backwards compatibility with soupy data

* Broken quotes needs to be checked before RFC2231 otherwise the filenames are
  not correctly found

* Parsing "files" out of the header was converted to an empty string instead
  instead of nil when the body was empty.

I love working at the #OSL