Constraint -layout*, -reloadRowsFromArray:toArray:

[UPDATED]   -[NSLayoutConstraints apply] -> layout/WithConstant:/priority: for a cleaner approach to layout as a result of constraint updates.
[FIXED]     When doing layout from constraints, force layout on the items and also check the container.
[ADDED]     -[UITableView reloadRowsFromArray:toArray:] convenient method of doing precise animated table view row updates by inspecting the changes to the backing collection.
Merge branch 'master' of github.com:Lyndir/Pearl