testmutableFraction has been uncommented
WCSMutableFraction class has been created
Methods with return type void have been Created
Few edit for WCSFRAction
did some edit on wcsFraction and finished  adding methods in WCSMutableFraction.
Logic added for setNumerator...
Add method has been added for WCSFraction. methods have been copied for adding and multiplying in WCSMutable...
mutator method for numerator and denominator added