Improve imdb lookup via google, plus utf8 and path fixes

What a nice project, however I encountered some issues and I figured I could help.
I tried it on my iTunes library, and had 2 major issues :
- Quality does not strictly follow your format, it's written as ``(1080p HD)`` or just ``(HD)`` (it will only keep an exact quality, HD is not explicit alone, but it could be set to 720p)
- It was missing the m4v format
- Imdb has some titles translated, not omdbapi, it now uses the imdbID
- Special chars in filenames were not properly handled, I hope I made it right
- Path to the script was not detected on my mac, I think I used the cross platform snippet to fix it