Expose Lambda Context Object in current_request

I'm using [fleece](https://github.com/racker/fleece) for its logging and AWS X-Ray integration in my Lambda work. Often I'll use the `log_group_name` and `log_stream_name` from the supplied [Context Object](http://docs.aws.amazon.com/lambda/latest/dg/python-context-object.html) to direct the `fleece` logging.

It appears Chalice does not expose the `context` object in the `current_request` (browsing https://github.com/awslabs/chalice/blob/f8b576562ac758aa3786243c9baeb82222935f19/chalice/app.py#L551-L580).

Is this something that might get added in the future?