remove usages of computed.volatile#1

calebrutland wants to merge 4 commits intosecondstreet:xy-yx-sorting-ember-3secondstreet/ember-sortable:xy-yx-sorting-ember-3from

calebrutland:xy-yx-sorting-ember-3calebrutland/ember-sortable:xy-yx-sorting-ember-3Copy head branch name to clipboard