Resolve syntax issue with route overloads

Resolve issue with route overloads by removing the route overload that
returns void in favour of those that return Application (this matches
the library code)

sammyjs/sammyjs.d.ts

@@ -81,7 +81,6 @@ declare module Sammy {
         $element(selector?: string): JQuery;
         after(callback: Function): Application;
         any(verb: string, path: string, callback: Function): void;
-        route(verb: string, path: string, callback: Function): void;
         around(callback: Function): Application;
         before(options: any, callback: Function): Application;
         bind(name: string, callback: Function): Application;