Update to 2.3.1

Update podspec

Goodbye old friend

Undeprecate -[ASCollectionView indexPathForNode:] (facebookarchive#3032)

Fix a warning preventing pod spec validation. (facebookarchive#2989)

* Fix a warning preventing pod spec validation.

* Add comment, thanks @adlai.

Update to 2.0.2

[ASDataController] Ensure ASRangeController has an opportunity to upd…

…ate visible nodes before they're deleted by -reloadData path. (facebookarchive#2815)

This change is specific to the reloadData path, which had the last-known occurrence of "deallocated while marked visible".

facebookarchive#2711

Update to 2.0 (facebookarchive#2735)

Update to RC 2 (facebookarchive#2723)

Merge branch 'master' into HEAD