Create standard datasets for testing the code

[jsv1206]

Datasets of varying complexities

• line fit
• simple strong lensing with 1 variable
• strong lensing with 5 variables

[beckynevin]

We already have a linefit dataset. To do: definitely test with many variables. Options: Jason already has a saved dataset for strong lenses with 1 parameter.

[bnord]

Should we ship small data sets with the repository for testing or will those get stored somewhere else?

[bnord]

probably our minimal examples should be

1. 1d in variable space, 1d in param space
2. 2d in variable space, 2d in param space
3. 10d in variable space, 10d in param space

These will give a wide gamut of plot shapes and sizes, and these cover what we see across our projects.