Preliminary changes for version 5 of CoolProp (not working)

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Update thermal corr for v5 of CoolProp complete

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge pull request #1 from ibell/CoolPropv5

Add CoolProp v5 support