Add a boolean to force lowercase routing

[saaratrix]

Add a boolean to the LocalizedRouteConvention when it generates the routes to force lowercase routing.
Also could add one to force PascalCase or other options maybe?

For example if we want to force lowercase

[LocalizationRoute("fi", "koti")]
public class HomeController {

  [LocalizationRoute("fi", "Meistä")]
  public void About () {}
}

Currently the routes generated would be

default: Home/About
finnish: fi/koti/Meistä

If we'd force the lowercase the routing convention would generate the template in lowercase.
So we'd get this:

default: home/about
finnish: fi/koti/meistä