1) Stepper working and updated settings UI
2) removed save,load,change methods  and added their functionality in viewonDisappear and viewOnAppear methods.
1) Changed single stepper to be three steppers and save data for 3 default tip amounts.
2) In TipViewController.m, added logic to updated segmented view by getting keys for objectts saved in NSUserdefault view.
Merge pull request #2 from RattanPriya/settings

Settings