The dict representation of this sentence.

def dict(self):
    '''The dict representation of this sentence.'''
    return {
        'raw': self.raw,
        'start': self.start,
        'end': self.end,
        'entities': [(e.tag, e) for e in self.entities],
        'tokens': self.tokens,
        'words': self.words,
        'pos_tags': self.pos_tags,
        'language': self.language.code,
        # TODO: 'polarity': self.polarity,
    }