rename IEA37_Site and HornsrevSite, more documentation

_notebooks/elements/Hornsrev1Site.ipynb

_notebooks/elements/HornsrevSite.ipynb

_notebooks/elements/IEA37Site.ipynb

_notebooks/elements/IEA37Turbine.ipynb

_notebooks/elements/IntroWindTurbines.ipynb

_notebooks/elements/V80.ipynb

_notebooks/elements/WindTurbines.ipynb

_notebooks/elements/fuga.ipynb

_notebooks/elements/noj.ipynb

_notebooks/make_notebooks.py

_notebooks/templates/windturbines.ipynb

docs/notebooks/IEA37Site.ipynb

docs/notebooks/IEA37Turbine.ipynb

docs/notebooks/V80.ipynb

docs/notebooks/fuga.ipynb

docs/notebooks/noj.ipynb

docs/source/site/UniformWeibullSite.rst

docs/source/site/hornsrev.nblink

docs/source/site/hornsrev1.nblink

docs/source/site/site.rst