Add charset detection for subtitles

[Petr Nejedly]

This library seems to help: https://code.google.com/p/juniversalchardet/

http://stackoverflow.com/questions/3759356/what-is-the-most-accurate-encoding-detector

http://site.icu-project.org/home

[arch linux]

Yeap, it would be nice to see my greek (cp1253) srt subtitles showing properly, without having to convert them to utf-8 in MediaBrowser!

[Petr Nejedly]

@tritonas00 Can you attach an example srt file pls?

[arch linux]

Claire-Leon.srt is ISO-8859-7 and luso-red.srt is cp1253 (from 00:23). Setting cp1253 in any player (vlc smplayer ...) shows fine.

[arch linux]

Re uploaded this because of some error in filename i think

[arch linux]

Nice! Can't wait to try it!