Geo-espresso

Changed examples

- `XrayTomography` compatibility for different PIL versions

Changed examples

- `XrayTomography`
- allowed `kwargs` for plots
- more data points for first example

Changed examples

- `FmmTomography`
- `kwargs` that can be passed down to waveTracker functions
- `np.random.seed` instead of `random.seed`
- `XrayTomography`
- changed cmap to be blue

Changed examples

- `FmmTomography` (`plot_model(model, with_paths=False, return_paths=False`))

Changed examples

- `FmmTomography` (return "paths" when plotting the model and `paths=True`)

Changed examples

- `FmmTomography` (minor changes; all in slowness space)
- `XrayTomography` (additional inlab-logo example)