fix(router): enable async configureRouter for app-level router
fix(router): enable async configureRouter for app-level router

behzad88/router,davismj/router,bfil/router,StrahilKazlachev/router,alsoicode/router,jods4/router,aurelia/router,hitesh97/router,bryanrsmith/router,jdanyow/router,aurelia/router,Roustalski/router,milunka/router,cmichaelgraham/router,JeroenVinke/router