typo

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added mass-based methods to python wrapper

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge branch 'master' of https://github.com/coolprop/coolprop
MATLAB works on windows - 32-bit and 64-bit

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