Ability to generate sessions on demand

[aronchick]

Required Functionality
As a user, I'd like to represent a webserver completely - similar to the example currently in the docs, but that spits out sessions (live) when running. Sessions could be up to long, but could follow power law like decay (e.g. 90% of people visit 1 page, 9% visit 2, 0.9% visit 3, etc).

The key here is basically taking the existing tool but allow it to run forever, and to create log entries per second (or whatever).