Better HTML __repr__ methods #68

Hi,
I wanted to check if it would be good to have better HTML repr methods for various tinyGP objects. As an example, I am pasting a screenshot showing the GP object shown in the Jupyter notebook for GPy.

Some of the candidates would be:

• GP object
• Conditioned GP object
• Kernel (which looks fairly good already)

If this makes sense, what first object would you recommend creating HTML repr for? What information would be good to get into the tabular format?

I can have a student make a PR for this if this is interesting.

Here's a minimal example on how someone may want to go ahead with implementing this feature.