Bugfix to remove visualization warning and handle zero wind speeds

Specified visualization shading to remove warning from visualizations
Introduced masking to handle input wind speeds of zero

v2.2.2

Bugfix to correctly sort frequency for AEP calculations.

Code contribution from @zerweck

v2.2.1

Enhanced bounds for Ct/Cp interpolation (#166 )

v2.2.0

Add TKE and TI mixing to GCH (#158)
Improved run-time performance (#157)
Bug fix in energy ratio calculation (#156)
Interpolate Power instead of Cp for turbine performance (#153)
Bug fixes and small feature improvements
Documentation updates

v2.1.1

This release updates the default tuning parameters in the Crespo-Hernandez turbulence model.

v2.1.0

This release of FLORIS includes the following new features and updates:

• Improved logging infrastructure for console logging and file logging
• Expanded examples
• Support for Python 3.6
• Updates to GCH vortex calculation and effective yaw
• Improved tuning
• Added infrastructure for pre-commit hooks and consistent source code linting

v2.0.1

Update version number to 2.0.1

v2.0.0

Merge branch 'develop'

# Conflicts:
#	README.rst
#	docs/conf.py
#	docs/index.rst
#	docs/requirements.txt
#	requirements.txt
#	setup.py

v1.1.4

This bug fix release corrects an issue plotting cut-through planes where nans occured on boundary of plane

v1.1.3

A bug was identified where a turbine's turbulence intensity (TI) was retained even after reinitializing the flow field. Code was changed to correctly reset the TI using the reinitialize_turbines() method.

This was described fully in pull request
#16