Changes for 0.2.0 version

[mozharovsky]

Summary

CVCalendarKit will be integrated into CVCalendar project in order to support date management stuff.

Upcoming changes (v0.2.0)

• [ ] Scalar operations with values (today.day == tomorrow.day instead of today.day.value() == tomorrow.day.value())
• [ ] New operator for constructing a new date with a range (i.e. replacement for ==, might be ~> or set)
• [ ] iOS 7 support
• [ ] Add custom Date -> String formatter styles (remove enum)