Fixed touch recognition in gridHeaderView/gridFooterView
Fixed touch recognition for gridHeaderView/gridFooterView
Fixed gridHeaderView/gridFooterView layout when sticked to the screen
Fixed an issue with cells insertion: the delegate method -gridView:willDisplayCell:atIndexPath: was called too early. May cause issues in your code if you use asynchronous (but yet fast) tasks when this method get fired.
Merge remote-tracking branch 'upstream/master'