xxxxx.xxxxx.keywords.delete
        ===================================
        删除一批关键词

def delete(self, adgroup_id, keyword_ids, nick=None):
        '''xxxxx.xxxxx.keywords.delete
        ===================================
        删除一批关键词'''
        request = TOPRequest('xxxxx.xxxxx.keywords.delete')
        request['adgroup_id'] = adgroup_id
        request['keyword_ids'] = keyword_ids
        if nick!=None: request['nick'] = nick
        self.create(self.execute(request), models = {'result':Keyword})
        return self.result