more tests in EllipticArc
refactor method getBoundaryRectangle and create method getExtremePoints
create global varables semi-major axis and semi-minor axis
remove methods seters
javadoc constructor of EllipticArc
refactor method equals and remove methods geters of EllipticArc
refactor method calculateFocusPoints of EllipticArc
remove blank spaces in Retangle