square/objc-TimesSquare — pull request #22 by kemenaran (2013-04-19 12:13:54+00:00)
Title: Allow the date to be deselected

Currently there is now way to de-select a previously selected date in the calendar. Setting the selectedDate to nil is an error: NSCalendar spits warnings to the console when it attempts to perform date calculations on a nil object.

This commit allows to de-select a date in the calendar by setting selectedDate to nil.