Fix encoding issue with html5lib 1.0b1

Avoid specifying encoding when parse is called. Also, ensure that
content handled by the parser is unicode
Fix encoding issue with html5lib 1.0b1

Avoid specifying encoding when parse is called. Also, ensure that
content handled by the parser is unicode
Merge branch 'html5lib-unicode-fix' of github.com:operasoftware/oex2nex into html5lib

* 'html5lib-unicode-fix' of github.com:operasoftware/oex2nex:
  Fix encoding issue with html5lib 1.0b1
Merge pull request #4 from operasoftware/html5lib-unicode-fix

Html5lib unicode fix