FSCalendar Improvements

[pcs289]

Hey @f33chobits,

First of all thank you for FSCalendar it certainly is a nice tool for iOS. Here I suggest a couple of improvements for it:

· FSCalendar should let select multiple dates by the user (with more than one circle).
· FSCalendar should programmatically let add circles to the desired dates(for instance from a [NSDate]).

Thank you again for the effort you have put in it!

[WenchaoD]

Thanks for your advice.

As for the first one, I'll add it later. It should take some time.
As for the second one , you can do it by setting the selectedDate of FSCalendar, but there seems to be a little problem calling it in viewDidLoad, I'll fix that later.

Thanks again.