Ryan MacLean 7ce94eb468 Cleaning Up Dockerfile Layers Per Official Docs ...

From the official docs: 

```
Note: The official Debian and Ubuntu images automatically run apt-get clean, so explicit invocation is not required.
```

Also added ` && rm -rf /var/lib/apt/lists/*` as part of the install line which probably does what was intended (no need to make a new layer). 

Added apt-get update to the RUN payload, as it should be part of the same layer. 

Both are documented here: https://docs.docker.com/engine/userguide/eng-image/dockerfile_best-practices/

2017-04-30 15:04:00 -07:00

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