Make eval workflow reproducible with minimal dataset (#21)

Makes the evaluation notebooks reproducible from the repo state by committing a minimal subset of datasets. This is essentially the smallest version of the dataset (reductions applied) that can reproduce the figures; the users still have the option of running the notebooks from the full dataset if they have access to it.

Update readme w/ preprint and dataset info (#20)

More figure updates (#17)

- change E4 bar plot to relative error
- output figures as .eps for GMD

manuscript preprint release