A test case to reproduce an animation bug.
added support for the collection view cell's [will/did]TransitionFromLayout:toLayout:
Add some documentation
Code style
Fix stack overflow caused during scroll view delegate callbacks
Document delegate setting
mostly code style improvements
Merge pull request #246 from jnjosh/master

Added support for [will/did]TransitionFromLayout:toLayout:
Add note about willTransitionFromLayout call
add kPSTEnableFastAnimationTest to enable/disable the test
Merge branch 'master' into animation-bug
Reverts 09ae07dca, thus fixing #244.
use modern objc syntax
Fixes view reusing after animations
Added PSTCollectionElementCategory and exposed layoutAttributesForSupplementaryViewOfKind:atIndexPath: for subclassing layouts
Implement Decoration views
Reuse decoration views after animation
Merge pull request #250 from kgn/master

PSTCollectionElementCategory and layout subclassing
Merge pull request #252 from cysp/for-review/decoration-views

Implement Decoration views
Revert commits related to delegate setting

This reverts the following commits:
- efc4f9948db0a89435627bde32d2232efc04d020 (modify delegate setting)
- bca811fc9618236c937d3945834d81201a7080ed (comment on the modification
that was made)