bugfix and new feature

Hi, I encountered a bug while downloading English subtitles for Family.Guy.S10E12.HDTV.XviD-LOL.mp4. A conversion from non-ascii unicode to string resulted in a UnicodeEncodeError. The solution was to remove the non-ascii characters.

I found the bug while implementing a new feature. You see, I have been working on this [video organizer](https://github.com/JoelSjogren/video-organizer) for the past week. When organizing files, it simplifies names, e.g. Family.Guy.S10E12.HDTV.XviD-LOL.mp4 -> E12.mp4. Because of this, I was unable to use your nice tool. This has now been worked around by reading the original filename from another file.