'Assumes that the handler has been informed. Fetches Tweets from
search_tweets generator output and passses them to handler
:param str keywords: A list of query terms to search for, written as        a comma-separated string.
:param int limit: Number of Tweets to process
:param str lang: language'

def _search_tweets(self, keywords, limit=100, lang='en'):

    while True:
        tweets = self.search_tweets(keywords=keywords, limit=limit, lang=lang, max_id=self.handler.max_id)
        for tweet in tweets:
            self.handler.handle(tweet)
        if (not (self.handler.do_continue() and self.handler.repeat)):
            break
    self.handler.on_finish()
