add ping robinson equation of state,
add pr test, add functions for
calculate some thermoPhysical properties like enthalpy...,
add builtin class for builtin functions that eml supports
Merge branch 'master' of http://github.com/vimalaad/VirtualLaboratory

Conflicts:
	.gitignore
Merge branch 'master' of http://github.com/vimalaad/VirtualLaboratory

Conflicts:
	.gitignore