Add new dequeued cell below scroll indicator view.
Added support for custom subclasses of PSTCollectionViewLayoutAttributes
Merge pull request #222 from juolgon/master

Add support for custom subclasses of PSTCollectionViewLayoutAttributes
Add UILabel highlight log output
Update LICENSE
Merge pull request #223 from taiyangc/selection-example

Add UILabel highlight log output
Remove unused gesture recognizer.
Merge pull request #227 from educreations/remove-gesture-recognizer

Remove unused gesture recognizer.
228 fix
Merge pull request #229 from gavrix/bugfix

#228 fix
Add new cells in the order defined by layout attributes
Merge pull request #232 from alexanderedge/master

Cells are not added in the same order as layoutAttributesArray
Fixes an issue where cells weren't being drawn

	- When the bounds were being updated frequently removing old cells first would sometimes result in the superview of a visible view being nil. Adding new cells first prevents this and allows us to optimize the creation of the allVisibleItemKeys set by only iterating over _allVisibleViewsDict once.
Merge pull request #233 from 500px/Issue#226-Dissappearing-cells

Issue #226 -  Fixes an issue where cells weren't being drawn
Cells Missing after updateVisibleCellsNow

	In some cases where the cells are sufficiently large and `showsHorizontalScrollIndicator` and `showsVerticalScrollIndicator` are both `NO` the number of subviews becomes zero. If this happens and `self.dragging` is `YES` then we are trying to insert the cell at a negative index which will not add the subview. Any subsequent insertion will also fail since the number of subviews will still be zero. This fix ensures that we insert the cell at a non-negative index.
Adds inline documentation to fix and cleans it up a bit
Merge pull request #235 from 500px/Missing-Cells-take-two

Fixes issue where Cells are Missing after updateVisibleCellsNow
some explanation in comments added
Merge pull request #239 from gavrix/bugfix

some explanation in comments added
Modify highlighting behavior when cell's setHighlighted method is not overwritten - specifically touchesMoved behavior