Example Required: Inhomogeneous Time series

[mikecroucher]

NAG currently has this: https://www.nag.co.uk/industryarticles/inhomogeneous_time_series.pdf

Requirements:

• [x] - Simple Python example showing how to call the routines
• [ ] - A more detailed example notebook that tells a story. Similar to the above pdf perhaps but with code and data

[caleb-hamilton]

I've tried to knock out the first one. Pull request: here