Added CoolPropTools from master

Signed-off-by: Ian bell <ian.h.bell@gmail.com>
Fixed CacheElement

Signed-off-by: Ian bell <ian.h.bell@gmail.com>
Fixed getHash function

Signed-off-by: Ian bell <ian.h.bell@gmail.com>
Added two more test protos

Signed-off-by: Ian bell <ian.h.bell@gmail.com>
Merge branch 'v5' of https://github.com/coolprop/coolprop into v5