First commit of ModelDataCompare_SSH.

@rsignell-usgs Here is my version of your inundation notebook as you requested.  Let me know if this is OK with system-test rules and/or if I need to review/add things.

[nbviewer link](http://nbviewer.ipython.org/github/ocefpaf/system-test/blob/ModelDataCompare_SSH/Theme_2_Extreme_Events/Scenario_2A/ModelDataCompare_SSH/Water_Level_Fernandes.ipynb)