Class CoordinateSystem
The class CoordinateSystem is to be defined. The files are created and
added.
Defined constructors and assignment functions for the class
CoordinateSystem.

Added a tolerance number SMALL_NUMBER to the file constants.h
Declared and defined access functions for the CoordinateSystem class.
Added vector transformation functions.
Added functions for rotating stresses and strains.
Corrected error in translation operation.
Merge pull request #6 from adhishm/version_0.0_simulateSingleSlipPlane_StrongInheritance_ClassCoordinateSystem

Version 0.0 simulate single slip plane strong inheritance class coordinate system