Fixes various typos in comments and headers
Called [super viewDidLoad] so that the view controller appears.
Added calls to [super viewDidLoad] so that the view controllers finish loading their views.
Added NSIndexPath+PSTCollectionViewAdditions.h/m to the projects so that calls to [NSIndexPath indexPathForItem:inSection:] work on pre-iOS 6.
Merge pull request #209 from guykogus/master

NSIndexPath error on iOS 5.x in demo projects
Always apply layout attributes. Fixes #203.
fix setCollectionViewLayout method's slowly & contentOffset setting
Merge pull request #210 from emeitch/fix_set_layout_offset

fix setCollectionViewLayout method's slowly & contentOffset setting
fix aborting at empty visibleItems
fix wrong predicates
Merge pull request #211 from emeitch/fix_set_collection_view_layout_bugs

Fix set collection view layout bugs
support iOS4.3
fix the issue that Supplementary datasource not called.
refactor, use property instead of raw ivar.
Merge pull request #213 from scutdavy/master

fix #212 Supplementary view invisible in ios 4.3
fix condition for layout invalidation
Merge pull request #214 from gretzki/fix-layout-invalidation-flow-layout

fix condition for layout invalidation
Remove garbage
Properly invalidates the flow layout if the sectionInset is changed.
Only apply cell attrs to cells

If a footer attr is applied to a cell, sometimes we get a duplicate cell, sometimes we crash, neither is desirable.

This is a better fix than https://github.com/educreations/PSTCollectionView/commit/838ec5e3133e90bce53e0872c678536b29247c74 which stopped working with https://github.com/scutdavy/PSTCollectionView/commit/a73d901ae707571bd6f3a3b2f884ef27fafc6e11