Eine Menge Aufräumarbeiten.

* Eine Testsuite um Mahrjong Ranking Berechnungen zu testen
* Erste Arbeiten um die Workarounds aus dem "utils" Paket los zu werden.
* Vieles am Code umformatiert für PEP8 conformität

src/mahjong_ranking/managers.py

@@ -42,14 +42,22 @@ class HanchanManager(models.Manager):
         season = season or date.today().year
         return self.confirmed_hanchans(user=user, season=season)
 
-    def user_hanchans(self, user, **kwargs):
+    def user_hanchans(self, user, since=None, **kwargs):
+        """
+        
+        :param user: User Object, or an player_id as integer 
+        :param since: optional a date value since when you want to hanchans
+        :return: 
+        """
         queryset = self.filter(
             models.Q(player1=user) | models.Q(player2=user) |
             models.Q(player3=user) | models.Q(player4=user)
         )
-        queryset = queryset.select_related().order_by('-start')
+        if since:
+            queryset = queryset.filter(start__gte=since)
         if kwargs:
             queryset = queryset.filter(**kwargs)
+        queryset = queryset.select_related().order_by('-start')
         for hanchan in queryset:
             hanchan.get_playerdata(user)
         return queryset