API Improvements: Editing & Styling

1. Moved CalendarStyle to use structs instead of classes with NSCopying protocol support.
2. It is possible to move an event to the day before or after the currently visible on a timeline by dragging past midnight, either all the way up or down.
3. Fix fo issue #159

Pass date in the tap gesture recognizer delegate callbacks

Now CalendarKit passes the date which has been tapped on the timeline.
Breaking API change:

Before

func timelinePagerDidTap(timelinePager: TimelinePagerView)
func dayViewDidTapTimeline(dayView: DayView)

After

func timelinePagerDidTap(timelinePager: TimelinePagerView, date: Date)
func dayViewDidTapTimeline(dayView: DayView, date: Date)

Issue #224

Snapping behavior when editing events

1. Add snapping behavior when editing events
2. Create internal properties to expose snapping behavior as a public API later

Improve Dark Mode compatibility

Improve Dark Mode compatibility
Update example Dark style

Minor API updates

0.8.7

Release 0.8.7

Editing & Event Creation Support

CalendarKit has new API which now supports event editing and creation.

Fullscreen layout fix

Fixed issue #187.

Bugfixes

Fixed issues: #206, #207, #208.

Custom Calendar

Now CalendarKit supports custom calendar.

Introduce UIPageViewController

Introduce UIPageViewController to the CalendarKit