String including UTF-8 characters not working

[paulwoerks]

I've got problems pushing Strings including special characters to our server. Special chars like "Ä" simply convert to "?" when pushing a mutation. Our server uses UTF-8 so the problem must occure on the serialization process of the client or something.

I'd like to include UTF-8, characters. Is there any fix to this? Thanks in advance.

[dlorddd]

I have submitted a pull request to fix this behavior. Feel free to copy. It is not a lot of changes.
#33