New features
------------

    - Refactor :class:`tasks.snapshot`. Settings have been simplified and
      code maintenance has been eased. *by Cyril Fournier*,
    - Add new visualization :class:`visualization.Tree` for 2D, *by Pamphile Roy*,
    - Add ``global_optimizer`` option in settings for Kriging, *by Pamphile Roy*,
    - Move documentation to *read the docs*, *by Pamphile Roy*,
    - Add documentation for MASCARET and PCE, *by Matthias De Lozzo*.

Enhancements
------------

    - Export :class:`visualization.Kiviat` as a mesh, *by Pamphile Roy*,
    - Some visualization for MASCARET, *by Sophie Ricci*.

Bug fixes
---------

    - Point mixing when snapshots already exists, *by Pamphile Roy*,
    - Outlier are computed only once in f-HOPs, *by Pamphile Roy*,
    - PDF scaling, *by Pamphile Roy*,
    - Legend list for forward compatibility with MPL, *by Pamphile Roy*,
    - Range color bar, visualization ticks default, *by Pamphile Roy*,
    - Driver exceptions, *by Pamphile Roy*,
    - Encoding errors in schema with python 3.5, *by Pamphile Roy*,
    - Settings checking was not effective, *by Pamphile Roy*.
