cherry-pick e401024 from 0.2.17
cherry-pick e401024 from 0.2.17

fpipita/ui-router,wawyed/ng2,2947721120/angular-ui,angular-ui/ui-router,mattlewis92/ui-router,ui-router/angular,mattlewis92/ui-router,2947721120/angular-ui,ui-router/angular,angular-ui/ui-router,ui-router/core,TechNaturally/ui-router,codersongs/codersongs.github.io,fpipita/ui-router,ui-router/angular,fpipita/ui-router,TechNaturally/ui-router,ui-router/ng2,wawyed/ng2,wawyed/ng2,ui-router/core,ui-router/angular,2947721120/angular-ui,ui-router/ng2,angular-ui/ui-router,codersongs/codersongs.github.io