AngularJS routing without the hash '#'

I'm learning AngularJS and there's one thing that really annoys me.

I use $routeProvider to declare routing rules for my application:

$routeProvider.when('/test', {  controller: TestCtrl,  templateUrl: 'views/test.html'}).otherwise({ redirectTo: '/test' });

but when I navigate to my app in browser I see app/#/test instead of app/test.

So my question is why AngularJS adds this hash # to urls? Is there any possibility to avoid it?