Fixed derivatives for Lemmon2005

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
docs for dTau3 derivation from Lemmon2005

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Fixed dDelta3 for Gaussian Helmholtz term (70 tests fail)

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Decreased step size in numerical derivative for Helmholtz tester

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
speed of sound added back to high level wrapper

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added structure of incompressible library and backend - the core is there, implementation is empty.

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

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

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Copy Catch header as part of build process

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