Secant obeys the maxiter parameter

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Improvements to solvers at low pressure/temperature

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Moved the plotting shim functions back to CoolProp.Plots.Plots and added import to CoolProp.Plots.Plots

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Added viscosity correlation for n-Hexane

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Fixed bug with saturation calls using REFPROP and mixtures.  Mole fractions were not being re-calculated properly (https://github.com/ibell/coolprop/issues/28)

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Set reference state for enthalpy for a fluid by changing phi0 terms

Signed-off-by: Ian Bell <ian.h.bell@gmail.com>
Merge remote-tracking branch 'refs/remotes/origin/master' into twophaseCVandA

Conflicts:
	CoolProp/gitrevision.h
Added reference to Matthis' paper as Thorade-EES-2013.