* Added more CF-names to the velocity list.
* Added ioos module with system-test functions.
* Replaced `get_coops_longName()` with `get_coops_metadata()`
* Added Root Mean Squared Error`rmse()` and all of sklearn.metrics
(`mean_absolute_error`, `mean_squared_error`, `median_absolute_error`,
`r2_score`, `explained_variance_score`).