add time ago on recent items

+ move to waitress wsgi server
+ refactor dates utils
+ create locustfile for stress test

locustfile.py

@@ -0,0 +1,8 @@
+from locust import HttpUser, task
+
+class HelloWorldUser(HttpUser):
+    host = "http://localhost:1980"
+
+    @task
+    def hello_world(self):
+        self.client.get("/getall/artists?start=0&limit=50&sortby=created_date&reverse=1")