Added support to Unicode Utf8 strings

Hey,

First of all, I would like to Thank You for the great tool. I'm so excited to use this on my project, but I found a problem using Unicode UTF8 strings because in my language I use accents that wasn't recognized by default string reading... So I made a patch to Your lib and I would be happy if You accept my Pull Request.

Regards from Brazil!

Jonhnatha Trigueiro