Added Jenkins recipe

- Added example to main recipe
- Fixed some syntax bux, and now run as deploy user
- Recommented example line in main recipe, and updated Jenkins recipe's README
- Recommented example line in main recipe, and updated Jenkins recipe's README
- Added utility recipes for Jenkins slaves using Swarm
- Added documentation for Jenkins slaves with Swarm
- Configured Swarm to run as Deploy user
- Fixed incorrect user setting in Swarm monit script