Dates selection state issue.

[RanjitKadam]

Firstly, thanks for the awesome lib.

Hey, I have a requirement where I want to select multiple dates and when I come back again to the calendar, I need to show those dates selected, with some custom color, and when user clicks those dates again, then it should get deselected.

for ex: I open the calendar, select 4, 6, 7, then I close the calendar and open again, then it should show 4, 6, 7 as selected, now when I click on 4, 6, 7, then the dates should get deselected.

[WenchaoD]

1. For multiple selection, see MultipleSelectionExample
2. For selecting dates manually, use [calendar selectDate:date]
3. For saving your selection dates, use NSUserDefaults or some other cache framework.