Fix unicode handling in the main pattern + clean pyc files

Previously, the sentence `Je mange de la mâche.` was split on `â`. The reason was that the main pattern wasn't handled as a unicode string and the `’` of the main pattern contained a `â` when turned into Latin1 (the default encoding used in this case?). That resulted in the `m[’]` part of the pattern being a match for the `mâ` part of the sentence.