Dockerization of datastringer

Looks like a cool project!

I run a mac primarily, and am also a fan of Docker (https://www.docker.com/) - So I thought I would take a stab at a Docker container for this.

This does not directly address issue #9, but provides a way to try this out in conjunction with boot2docker (http://boot2docker.io/)

I have only have my container running for a short time, so have not been able to really test the cron functionality, but I will report back with any issues.