v1.2.7

Trim & Update Demo.

v1.2.6

• Add Transition Mode

v1.2.5

• Trim.

• Add sj_fullscreenGestureState method.
• Add Transition Mode.
• Remove ObserverHelper.

v1.2.4

Remove `ObserverHelper`And Trim.

v1.2.3

Fix `UIPageViewController` some problem.

v1.2.2

Fixed a problem. `Transitioning` trigger gesture.

v1.2.1

Fix `subScrollView.contentInset`

v1.2.0

Remove `SJ_resetScreenshotImage` emthod.

v1.1.6

• remove Nav Delegate
• fixed UIImagePickerController some problems.

Renamed `SJFullscreenPopGesture`

v1.1.4

Update spec