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.
I would suggest to use the same logic as in wikipedia generator by @amayer5125 [code](https://github.com/sealemar/BingRewards/blob/master/pkg/queryGenerators/wikipedia.py#L43).
1. ```br.opener``` has cookies support - see [code](https://github.com/sealemar/BingRewards/blob/master/pkg/bingRewards.py#L74)
2. it has some headers which may be specifically configured for a request
3. use
```
with self.bingRewards.opener.open(request) as response:
    page = helpers.getResponseBody(response)
```

as ```helpers.getResponseBody(response)``` automatically detects whether a response has to be deflated. See [code](https://github.com/sealemar/BingRewards/blob/master/pkg/helpers.py#L51)