"exitStackTrace" and "gzip" enhancements together in a single pull request.

As mentioned above, this pull request includes both the gzip and the exitStackTrace enhancements.

The following screenshot shows how to enable and view the stack trace that is appended to the exit event.

![image](https://f.cloud.github.com/assets/175773/1700598/e808a646-6023-11e3-8438-9266b1791dd9.png)