Merge branch 'mmpe' into 'master'

wetb/hawc2/htc_extensions.py

wetb/hawc2/htc_file.py

wetb/hawc2/shear_file.py

wetb/hawc2/tests/test_htc_file.py

wetb/hawc2/tests/test_shear_file.py

wetb/utils/caching.py

wetb/utils/tests/test_caching.py

wetb/utils/tests/test_files/test.csv

wetb/wind/__init__.py

wetb/wind/shear.py

wetb/wind/stability.py

wetb/wind/tests/test_Shear.py

wetb/wind/turbulence/mann_parameters.py

wetb/wind/turbulence/mann_turbulence.py

wetb/wind/turbulence/spectra.py