#735: UIDatePicker toolbar added
#735: DatePickerView class created
#735: PacoDatePicker class files
#735: project file commit
#735: code review fixes
#735: minor fix
#735 merge and fix conflicts
#735 change title and date to be copy properties to avoid potential bugs, remove legacy code, clean up code style.
#735 refactor to have better encapsulation for PacoDatePickerView
#735 change title
#735 clean up unnecessary verbose code
#735 remove legacy add button, code reorganization, remove legacy code
#735 code refactoring
#735 code reorganization, refactor instance variable to start with an underscore
#735 code refactoring
#735 remove legacy code
#735 code refactoring
#735 use completion block to handle the finish up work after editing
#735 refactor legacy code
#735 code refactoring