Fix title sanitation in windows

[Chronial]

This fixes the sanitation of titles for filenames in windows, which was broken (eg. multiple errors with this vid: http://www.youtube.com/watch?v=CT2rr0Otyto).

[MDCore]

I would find this very useful. I often have problems with the script creating semi-existent files because of non-windows-safe characters.

[Chronial]

any comments on this?

[ssokolow]

To be 100% certain you're safe, I'd actually go a step further since, as I mentioned in issue #441, FAT (eg. thumbdrives) has some restrictions over and above those of Win32-compatible NTFS filenames.

(FAT can't have ASCII control characters in its filenames, so you should also filter for \x00-\x1f and \x7f)

[FiloSottile]

As said in #500, here we should pull and.. (My fault)

[FiloSottile]

(see #500)

Actually, we already strip all those: (ok, let's add \x7f)

if char in u' .\\/|?*<>:"' or ord(char) < 32:

But I like the point of treating them differently, and of doing a pass of .strip('_') at the end.

[Chronial]

Thanks for fixing this :)