Use aiohttp application rather than server

We can do some route checking stuff later

catfish/router/__init__.py

@@ -9,7 +9,9 @@ async def handle_request(request):
 
 
 def get_server():
-    return web.Server(handle_request)
+    application = web.Application()
+    application.router.add_route("*", r"/{path:.*}", handle_request)
+    return application
 
 
 async def start_router(loop, port):