1. File rearangement 2. Add color constance 3. Optimize size calculation function 4. No need to set clipToBounds any more
1. Add `Roll` Example 2. Add invalidateAppearance: method in `FSCalendarAppearance` 3. Support borderColors and different shapes for different dates 4. Fix `placeholder selection` problem
1. Add delegate methods 1). `calendar:appearance:titleDefaultColorForDate:` 2). `calendar:appearance:subtitleDefaultColorForDate:` 2. Version bump 3. Add delegate appearance example
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