Ioos-tools

* 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`).

* Lazy import SciPy.
* Factored `iris_utis.py` out of the module.
* Fixed a bug in `ndbc2df()`.

* `is_model()` now assumes that all "GRID" features that have the word AVHRR
are satellite data and not numerical models.

* In-lining folium maps HTML because embed HTML fails with sub-directories.
* Removed `standardize_fill_value()` (See
https://github.com/SciTools/biggus/issues/94).
* More workarounds for `SciTools/iris1568`

* Added ESRI map and HF Radar map layers.
* Fixed bug in `subset()` when searching for model titles.
* Added workaround for `SciTools/iris1568`

* Replaces `get_cubes()` with `quick_load_cubes()` and `proc_cube()`.