Add support for keeping letting cell nodes update to new view models when reloaded. #trivial #357
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-(BOOL)[ASCellNode canUpdateToViewModel:]
.YES
from that, we keep using the same node, and update the view model on a background thread, same as we'd allocate a new node.reloadItemsAtIndexPaths:
call to the UICollectionView, which may mean a flash for animated updates. Suppressing this call is something we do later.