Enhancements
* `Prediction.location` refactored to `Prediction.latlon` (Issue 8).
* Removed unused `Draws.alpha_samples_field` and `Draws.beta_samples_field` to cut down package size. Also, we dropped the maximum MCMC parameter ensemble size to 10,000 to further reduce size (Issue 1).
* Many `assert` errors replaced with full errors (Issue 7).
* Improved `pip` and `conda` install instructions (Issue 6).
Bug fixes
* Minor corrections to documentation and docstrings (Issue 10, Issue 5).
* Trim burnin from tau2 MCMC params (Issue 3)