Implemented viscosity for xylenes

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
First cut at conductivity for xylenes

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added (failing) tests for transport of xylenes

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

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge branch 'master' into xylene_transport
Update the ECS solver, all transport tests pass

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge pull request #338 from CoolProp/xylene_transport

Xylene transport