Does not work in IE

Line 49 in the compiled JS throws an error.

http://stackoverflow.com/questions/19321938/invalid-calling-object-error-in-ie

Replacing it with `t = ({}).toString.call(a);` solves the problem.

https://github.com/angular/router/commit/750aa8201c792b875ab8e9bde997e062d21aa5e4
Seems like Object.prototype is good enough too.

Win 7 / IE 11
