Support for IIS

The $_SERVER['ORIG_PATH_INFO'] on IIS return '/index.php' on the root of the website, and Toro expect just '/'. So I added a conditional test to avoid that problem.

Maybe not the prettiest solution, but works fine on IIS and Apache.
Merge pull request #40 from YohannParis/patch-1

Added web.config example for IIS (those poor folks)