Fix dateKey bug

Fix dateKey bug

Change animation effects

Change animation effects and change one interface

Merge pull request CoderMJLee#64 from heistings/dev_prepareFor2.0

Dev prepare for2.0

Make interface more restrict

Such as removing weak from readonly property

Adjust inner code implementation

Adjust inner code implementation, will not affect outer using.

Fix NoMoreData problem

Fix NoMoreData problem

Change [super setState:state] position

Change [super setState:state] position to fix a little bug

Modify collectionView demo

Modify collectionView demo

Add interface for setting updatedTimeTitle

Add interface for setting updatedTimeTitle

Add more interface in one line code

Add some dateKey: one line code method