googleTrends addition

Let me know if there are some changes that should be done, I am testing this my self now and it at least has run two days in a row for me.
Actually I was asking about ```self.suggestions = set()```. It appears not to be used anywhere in your code.

Regarding ```MAX_QUERY_LEN``` - my intent was to have query terms no longer than ```maxQueryLen```. I can't remember why exactly i had it. But I think you can safely remove it from your code as you don't use it.