Add instructions for REFPROP integration on linux/OSX; closes #1303
Add instructions for REFPROP integration on linux/OSX; closes #1303

DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,CoolProp/CoolProp,JonWel/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,dcprojects/CoolProp,dcprojects/CoolProp,henningjp/CoolProp,DANA-Laboratory/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,dcprojects/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,CoolProp/CoolProp,dcprojects/CoolProp,henningjp/CoolProp,CoolProp/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,henningjp/CoolProp,dcprojects/CoolProp,henningjp/CoolProp,DANA-Laboratory/CoolProp,JonWel/CoolProp,CoolProp/CoolProp,dcprojects/CoolProp,DANA-Laboratory/CoolProp,DANA-Laboratory/CoolProp,henningjp/CoolProp,DANA-Laboratory/CoolProp,JonWel/CoolProp,dcprojects/CoolProp,JonWel/CoolProp