Remove debian packaging: will now be provided from repo pkg-emoncms

Hi,

This pull request may resolve #169  - I did a bunch of extra homework, and have come to the conclusion that blending the debian packaging and main source as initially proposed is the wrong approach; especially so if it's causing normal development of emoncms to be a bit more of a headache!

Instead, I'm now maintaining debian packaging as a separate git repo: [pkg-emoncms](https://github.com/Dave-McCraw/pkg-emoncms/tree/debian/8.0.3-1)

This means I can take care of debian tagging, patching etc. without creating extra work for the maintainers of emoncms itself. All I need is for you guys to add a plain old tag (such as `8.0.4` ) when you want changes to be made available for installation in the field and I can pick that up.