* Remove version of reflect_loss for multiple locations.
* Break wave_height_pierson out of reflect_loss_rough and make it a separate model.
* Bring implementations for reflect_loss_constant and reflect_loss_rough from *.cc to *.h file
* Simplify and document reflect_loss_rough implementation
* Change reflect_loss model documentation to say intensity instead of amplitude.

Issue: Cleanup usml::ocean API #64