ENH: Containerize application with Docker and push that to CF

[csmcallister]

The cloudfoundry environment is not the same as that we use for testing with Docker, particularly when it comes to using textract's dependencies (see #95 and #93). We should containerize the application and push that.

Possible

We should deploy the app with docker. This will require adding supercronic to our image as well as adhering to cloudfoundry's requirements.

Context

Handling the environment differences has been manageable so far, but it's not sustainable. It's also bad practice for the test and deployment environments to be different.

[csmcallister]

• [x] Update Dockerfile and crontab so that they contain the correct paths for executing the script.
• [x] Build the docker image and push to docker hub
• [x] Edit log settings so that supercronic logs in its opinionated way
• [x] Deploy image in cf and then check the logs after 24 hours to see that it worked.