Hotfix/fix ios10 bug#154

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Calvin-Huang wants to merge 2 commits into

CSStickyHeaderFlowLayout:masterfrom

Calvin-Huang:hotfix/fix_ios10_bug

Commits on Oct 24, 2016

Add condition to make sure cells are in the same section.
Calvin-Huang
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In iOS 10, UICollectionView & UITableView has the mechanism to prefetch cell, thus, there will be some header will not visible in screen and it can not be initialise by calling "layoutAttributesFor…
Calvin-Huang
committed