js/libs/ember-1.5.1.js
function() {
        if (this.state) {
          forEach(this.state.handlerInfos, function(handlerInfo) {
            var handler = handlerInfo.handler;
            if (handler.exit) {
              handler.exit();
            }
          });
        }

        this.state = new TransitionState();
        this.currentHandlerInfos = null;
      }
function() {
        if (this.state) {
          forEach(this.state.handlerInfos, function(handlerInfo) {
            var handler = handlerInfo.handler;
            if (handler.exit) {
              handler.exit();
            }
          });
        }

        this.state = new TransitionState();
        this.currentHandlerInfos = null;
      }
Clears the current and target route handlers and triggers exit
on each of them starting at the leaf and traversing up through
its ancestors.