Create aggregator for Github issues

In order to run this you need to pass in the name of the repos file (this uses the same one as Vaidik's xfails job) and a Github API Token. I have created an anonymous api token that gives is read-only access. There is no reason that this api token cannot be made public. The value of the token is `0c66ab2b3fceec29a82ec3110679d0fac05af57a`.

A sample command line would be:

`generate_github_issues_dashboard_data.py repos 0c66ab2b3fceec29a82ec3110679d0fac05af57a`

Once merged this can be set up with a job on Jenkins similar to the one we will have for the Marketplace tests dashboard, or it could be set up as a cron job anywhere that has access to the internet.