https://github.com/angular-ui/ui-sortable/pull/549
https://github.com/angular-ui/ui-sortable/pull/547
https://github.com/angular-ui/ui-sortable/pull/543
https://github.com/angular-ui/ui-sortable/pull/541
https://github.com/angular-ui/ui-sortable/pull/535
https://github.com/angular-ui/ui-sortable/pull/530
https://github.com/angular-ui/ui-sortable/pull/529
https://github.com/angular-ui/ui-sortable/pull/516
https://github.com/angular-ui/ui-sortable/pull/515
https://github.com/angular-ui/ui-sortable/pull/513
https://github.com/angular-ui/ui-sortable/pull/506
https://github.com/angular-ui/ui-sortable/pull/502
https://github.com/angular-ui/ui-sortable/pull/501
