Don't replace unicode escapes with the actual UTF-8 character.
Don't replace unicode escapes with the actual UTF-8 character.

Caters for servers that don't set a charset for libjass.js in the Content-Type header or HTML tag, and clients that end up interpreting libjass.js as system encoding and showing mojibake.

Fixes #65

Arnavion/libjass,Arnavion/libjass,Arnavion/libjass,joshuabrown-ellation/libjass,joshuabrown-ellation/libjass,joshuabrown-ellation/libjass