Oceans

* Fix `nanmean` and `nanstd` removed from latest `scipy`.

* Lazy imports.
* Several minor bug fixes.

Version 0.2.4, 05-May-2015.

* Added `woa_profile`.
* Re-write of `woa_subset` to use iris instead of Pandas.
* Deprecate 'state' option in soundspeed.

* Several small bugs and typos fixes.

* Mixed Layer Depth functions.
* Critical depth and Light extinction coefficient.
* Contributor: arnaldorussogmail.com | github.com/arnaldorusso

Version 0.2.1, 07-Apr-2014.

* Python3 support.

* Moved CTDProfile to a separated module (python-ctd).

* Added several of new functions and sub-modules
* CTDProfile class (pandas DataFrame for CTDs).
* time_series methods to extend pandas Series.