Update to the waves extremal analysis notebook

- Clean up notebook
- Use PYOOS to extract SOS data
- Use NetCDF4 to extract directly from DAP endpoint
- Read WIS data from JSON file that contains all of the WIS stations and
  annual maximums
Update README
Update to Extreme Waves

-Add timer to some of the more computationally extensive blocks of code
-Reorganize the flow of the notebook to better tell the story
Merge branch 'extreme_waves' of https://github.com/Bobfrat/system-test into Bobfrat-extreme_waves
Merge branch 'Bobfrat-extreme_waves'
Merge remote-tracking branch 'ioos/master' into extreme_waves

Conflicts:
	Theme_2_Extreme_Events/Scenario_2A_Coastal_Inundation/Scenario_2A_Extremes_Waves/Scenario_2A_Waves.ipynb
	Theme_2_Extreme_Events/Scenario_2A_Coastal_Inundation/Scenario_2A_Extremes_Waves/Scenario_2A_Waves.py
	Theme_2_Extreme_Events/Scenario_2A_Coastal_Inundation/Scenario_2A_Extremes_Waves/utilities.py
remove reference to numpy, make it np
Merge pull request #139 from Bobfrat/extreme_waves

Update to the waves extremal analysis notebook