Add section on linear programming

[drvinceknight]

With pulp

[IanHawke]

This may be useful: https://github.com/IanHawke/msc-or-python
Particularly: https://github.com/IanHawke/msc-or-python/blob/master/examples.ipynb
pulp part is near the bottom.

Note: I know next to zero about OR, and the OR people at Soton that I'm preparing this for know little Python, so we may have dropped key things.

[drvinceknight]

Thanks @IanHawke, I appreciate it. Lots of good stuff there, I'll be keeping an eye on that repo!

I'm quite familiar with pulp, I'm one of the developers of http://conference-scheduler.readthedocs.io/en/latest/

[IanHawke]

Thanks: I had been hoping you'd have a better example I could steal for the course, and the conference scheduler looks like a great link I can direct them to... 😄

[drvinceknight]

scheduler looks like a great link I can direct them to...

The repo is here: https://github.com/PyconUK/ConferenceScheduler and the documentation link includes an explanation of the mathematical model which might be of interest 👍