None returned for plain text files

[m-flak]

I've read #30, but I find that having do something like this (pardon the comments, direct copy-paste):

    def is_mimetype_family(self, want_family):
        our_type = filetype.guess(self.path)

        if our_type is None:
            # sometimes, filetype fails horribly
            # # like with text files. works great for images though
            type, encoding = mimetypes.guess_type(self.path)
            if type is None:
                return False
            if re.match(want_family, type) is not None:
                return True
            return False
        if re.match(want_family, our_type.mime) is not None:
            return True
        return False

It's a little counter-intuitive. Perhaps, you could utilize mimetypes as I have done.

I expected filetype to be a "one-stop shop" for mimetypes. Nevertheless, it is an excellent library for detecting mimetypes.