Fix for collection view cells not appearing when project is built in Xcode 6 running on iOS 7.

https://developer.apple.com/library/ios/releasenotes/developertools/rn-xcode/Chapters/Introduction.html.
Want NSOrderedDescending instead of NSOrderedAscending.
Should be Ascending ....7.1 < 8.0
replaced current checking with NSFoundationVersionNumber
changed commonInit_MyCollectionViewCell to commonInit

Suggestions from @bskinner
Merge pull request #190 from MIT-Mobile/3.6/ipad-news-iOS7-collection-view

Fix for collection view cells not appearing when project is built in Xcode 6 running on iOS 7.
Fix for issue #189. (iOS 8 unwind segues are not working)

modalPresentationStyle changed from default to currentContext
Must define anchor point.

AVC.popoverPresentationController is introduced in iOS 8 so we must check iOS version.
Add a standalone class for sizing UICollectionViewCells
Switch to using the sizing helper class
Using respondsToSelector to see if sharingViewController implements popoverPresentationController
Enabled saving images to camera roll.
Merge pull request #196 from MIT-Mobile/3.6/news-uicollectionviewcell-autosizing

3.6/news uicollectionviewcell autosizing
Merge pull request #195 from MIT-Mobile/3.6/ipad-news-sharing

iOS 8 iPad new sharing fix. Fixes #189.
Merge pull request #194 from MIT-Mobile/3.6/ipad-news-back-segue

Fix for issue #189. (iOS 8 unwind segues are not working)
Merge branch 'refs/heads/3.6/ipad-news' into 3.6/ipad-news-categories

Conflicts:
	Modules/News/News_iPad.storyboard
	Modules/News/iPad/View Controllers/MITNewsGridViewController.h
	Modules/News/iPad/View Controllers/MITNewsGridViewController.m
Fix merge.  Remove old height calculation code.