Jenkins

Puppet performs the following:
* Install Jenkins
* Installs appropriate plugins
* Add Jenkins job for saladbar if it doesn't already exist
 - Launch initial build for saladbar, running tests, coverage, and pylint
* Backup saladbar Jenkins job to /var/jenkins_config/

After deploying with vagrant, you can access the server via http://127.0.0.1:8080/jenkins/

Also added fixtures, which populate db user and sample ingredients, removing the need to store db.sqllite3 in the repo.
Note: the password for the Django root user is '1'