Saturation Vapor Pressure
This contains implementations of the different methods of calculating saturation vapor pressure referenced in #508. When a method is chosen, the others can be removed from the thermo file and tests updated, along with better documentation.
Just to clarify, this is waiting for a determination of which method to go with. Then the others will be removed, docstring updated, and tests updated.
I doubt a decision will be made before 0.6, but it's good to have this hanging around so we can move quickly when we have the cycles for it.
@dopplershift Not a problem, just letting both of you know that a detailed code review is not really important at this stage.