adding iam role association to launch configurations
Implemented xvfb install/config for Jenkins role
Implemented Java Runtime installation
Added Jenkins installation.  The apt package also creates
the user and installs jenkins as an init.d service
Install Jenkins and Java
Install Jenkins plugins (except Maven, which causes an exception)
Added (start of) browser script
Update ansible scripts for the jenkins vagrant box
Update ansible scripts
Add main.yml
add edxapp sandbox
Add edxlocal main
supervisor jobs for celery beat and celery worker.
Conditional runs for speedup.
New tasks for supervisor jobs.
Basic datadog install.
Cleanup.
Tasks to restart supervisor and supervisor managed jobs.
Obsolete
Builds the env definition via iteration.
Needed for cron job until celery beat is working.
Fixed crontab entry creation needed user.
sample notifier playbook.