Crawl user events - resolves #146

[danisyellis]

This PR adds functionality to crawl a user's events.
There is one test that is not currently passing. I'd appreciate some help figuring out how to get that last test to pass!

I will also be submitting a PR to https://github.com/microsoft/ghcrawler-cli with instructions on how to use this new functionality with the cli.
I've also added a bit of info to the "Operating" page of the wiki with instructions on how to queue users and will attempt to make a PR to the wiki with those changes as well.

[msftclas]

All CLA requirements met.

[danisyellis]

Here is the companion PR in the crawler-cli
microsoft/ghcrawler-cli#11

[danisyellis]

Without write/push access to the repo, I don't think I can edit the wiki page myself. I created a branch and tried pushing it but I don't have permission to do even that.
The wiki in my fork of the project was empty, so I pasted in the revised "Operating" page so that you can edit it into the wiki yourself if you like the changes https://github.com/danisyellis/ghcrawler/wiki/Operating

Let me know if there's something I'm missing and I should be getting you the wiki changes some other way :-)