fix(1.x): fix toString call for IE
fix(1.x): fix toString call for IE

Closes #208

rakeshbhavsar/router,JanPietrzyk/router,kyroskoh/router,JanPietrzyk/router,loomio/router,rakeshbhavsar/router,shangyilim/router,IgorMinar/router,loomio/router,shangyilim/router,IgorMinar/router,AyogoHealth/router,excellalabs/router,kyroskoh/router,AyogoHealth/router,shangyilim/router,IgorMinar/router,angular/router,excellalabs/router