Joe's stuff so far. Need to talk interchange.
Update Controller.cpp
Update Controller.h
Huge update of Numbers. Integer and Operator fully defined. Added Expression and Root classes.
Merge branch 'master' of https://github.com/COP3503group92/CalculatorProject.git
Updates for Shunting Yard
Update Controller.cpp
Update Controller.h
Delete Fraction.cpp
Delete Fraction.h
Modified main.cpp to reflect change of control to controller.
Merge branch 'master' of https://github.com/COP3503group92/CalculatorProject.git