Adding autoload of more stories to news categories.  #571

Added storyRefreshInProgress to make sure we don't signal a get more stories while we are refreshing.

We do not want to refresh loading cell if the cell is not visible or if the tableview is moving or there is no error.
If the tableview is moving we have already updated the status of the cell because we called this ourselves when we came across the cell.

If they are clicking the cell themselves the table is not moving and the cell is shown.

But if there is an error we want to change the cell.

References #571
Moved automatically loading of next stories to tableView:willDisplayCell:forRowAtIndexPath.
Referencing #572
Moved automatically loading of next stories to collectionView: willDisplayCell:forItemAtIndexPath

Referencing #572
Merge pull request #621 from MIT-Mobile/3.6/dev-intrepid-lwright

3.6/dev intrepid lwright
Fixed Map not showing all places (#612)
Maps now load locations for dining halls/retail venues (#594)
Fixed Events pulling next days info (#606)
Merge pull request #622 from MIT-Mobile/3.6/dev-intrepid-svoigt

3.6/dev intrepid svoigt
Merge pull request #572 from MIT-Mobile/3.6/news-autoloading

Adding autoload of more stories to news categories. Fixes #571
Fixed z index of map annotations to always push vehicle annotations below stops in shuttles #617
Replaced refresh button w/ pull to refresh in emergency VC #598
Close form sheet before opening maps in dining
Fixed dining maps in iPhone to show callout #596
Building services building selection now takes you back all the way to the form #585
Added padding to cuisines in dining retail venue detail #593
Fixed layout issue causing description to not layout properly in building services #588
Fixed height issue w/ maps type ahead