Add CI tasks that can be run in a Docker container

Enables a Docker based build server to create logsearch dev releases using a command like:

```
docker build -t $JOB_NAME $(pwd)

docker run -e BOSH_TARGET=https://xx.yy.zz.bb:25555 -e BOSH_USER=sudobot -e BOSH_PASSWORD=$SUDOBOT_BOSH_PASSWORD -v $(pwd):/workspace -t $JOB_NAME rake dev_release:create_and_upload_and_deploy
```

> Also, what are going to be happening with these dev builds?

I'd like the release TGZ to be published to S3.

Concerning uploaded blobs - yes; at the point you are happy with the blobs on your bosh-lite, and want to commit to `develop` to have the CI system create & deploy a (dev) release to our testing AWS cluster.

Its a similar workflow to "run the unit tests on my machine", then commit and have the build server run the tests on some standardised hardware.  It we end up with some additional blobs in S3; then that is a worthwhile price to pay.